Procure por b:skin após achar coloque isso em cima dessa linha 

.showpageArea a {
text-decoration:underline;
}
.showpageNum a {
text-decoration:none;
border: 1px solid #ccc;
margin:0 3px;
padding:3px;
}
.showpageNum a:hover {
border: 1px solid #ccc;
background-color:#ccc;
}
.showpagePoint {
color:#333;
text-decoration:none;
border: 1px solid #ccc;
background: #ccc;
margin:0 3px;
padding:3px;
}
.showpageOf {
text-decoration:none;
padding:3px;
margin: 0 3px 0 0;
}
.showpage a {
text-decoration:none;
border: 1px solid #ccc;
padding:3px;
}
.showpage a:hover {
text-decoration:none;
}
.showpageNum a:link,.showpage a:link {
text-decoration:none;
color:#333;
}

 Depois você pode personalizar facilmente apenas trocado as cores das letras, fundo e bordas, onde está:
border: 1px solid #ccc; é a cor e estilo da borda
background-color:#ccc; é a cor de fundo

Isso aparece varias vezes no código então sugerimos que modifique todos da mesma maneira senão quando exibir a numeração que não seja na primeira pagina, elas podem aparecer de cores diferentes, mas isso é uma questão de gosto, portanto depois que instalar a numeração façam os testes e deixem com as cores que gostarem mais.

Agora clique para salvar, não adianta visualizar o blog, pois ainda não verá nenhum resultado, então vamos colocar o código que faz aparecer a numeração, procure agora por Postagens no blog


Coloque o código abaixo entre </b:section> e </div>:

&lt;script type=&quot;text/javascript&quot;&gt;
function showpageCount(json) {
var thisUrl = location.href;
var htmlMap = new Array();
var isFirstPage = thisUrl.substring(thisUrl.length-5,thisUrl.length)==&quot;.com/&quot;;
var isLablePage = thisUrl.indexOf(&quot;/search/label/&quot;)!=-1;
var isPage = thisUrl.indexOf(&quot;/search?updated&quot;)!=-1;
var thisLable = isLablePage ? thisUrl.substr(thisUrl.indexOf(&quot;/search/label/&quot;)+14,thisUrl.length) : &quot;&quot;;
thisLable = thisLable.indexOf(&quot;?&quot;)!=-1 ? thisLable.substr(0,thisLable.indexOf(&quot;?&quot;)) : thisLable;
var thisNum = 1;
var postNum=1;
var itemCount = 0;
var fFlag = 0;
var eFlag = 0;
var html= &#39;&#39;;
var upPageHtml =&#39;&#39;;
var downPageHtml =&#39;&#39;;

var pageCount = 5;
var displayPageNum = 5;
var upPageWord = &#39;Anterior&#39;;
var downPageWord = &#39;Próxima&#39;;
var labelHtml = &#39;&lt;span class=&quot;showpageNum&quot;&gt;&lt;a href=&quot;/search/label/&#39;+thisLable+&#39;?&amp;max-results=&#39;+pageCount+&#39;&quot;&gt;&#39;;
for(var i=0, post; post = json.feed.entry[i]; i++) {
var timestamp = post.published.$t.substr(0,10);
var title = post.title.$t;
if(isLablePage){
if(title!=&#39;&#39;){
if(post.category){
for(var c=0, post_category; post_category = post.category[c]; c++) {
if(encodeURIComponent(post_category.term)==thisLable){
if(itemCount==0 || (itemCount % pageCount ==(pageCount-1))){
if(thisUrl.indexOf(timestamp)!=-1 ){
thisNum = postNum;
}
postNum++;
htmlMap[htmlMap.length] = &#39;/search/label/&#39;+thisLable+&#39;?updated-max=&#39;+timestamp+&#39;T00%3A00%3A00%2B08%3A00&amp;max-results=&#39;+pageCount;
}
}
}
}//end if(post.category){
itemCount++;
}
}else{
if(title!=&#39;&#39;){
if(itemCount==0 || (itemCount % pageCount ==(pageCount-1))){
if(thisUrl.indexOf(timestamp)!=-1 ){
thisNum = postNum;
}
if(title!=&#39;&#39;) postNum++;
htmlMap[htmlMap.length] = &#39;/search?updated-max=&#39;+timestamp+&#39;T00%3A00%3A00%2B08%3A00&amp;max-results=&#39;+pageCount;
}
}
itemCount++;
}
}
for(var p =0;p&lt; htmlMap.length;p++){
if(p&gt;=(thisNum-displayPageNum-1) &amp;&amp; p&lt;(thisNum+displayPageNum)){
if(fFlag ==0 &amp;&amp; p == thisNum-2){
if(thisNum==2){
if(isLablePage){
upPageHtml = labelHtml + upPageWord +&#39;&lt;/a&gt;&lt;/span&gt;&#39;;
}else{
upPageHtml = &#39;&lt;span class=&quot;showpage&quot;&gt;&lt;a href=&quot;/&quot;&gt;&#39;+ upPageWord +&#39;&lt;/a&gt;&lt;/span&gt;&#39;;
}
}else{
upPageHtml = &#39;&lt;span class=&quot;showpage&quot;&gt;&lt;a href=&quot;&#39;+htmlMap[p]+&#39;&quot;&gt;&#39;+ upPageWord +&#39;&lt;/a&gt;&lt;/span&gt;&#39;;
}
fFlag++;
}
if(p==(thisNum-1)){
html += &#39;&lt;span class=&quot;showpagePoint&quot;&gt;&#39;+thisNum+&#39;&lt;/span&gt;&#39;;
}else{
if(p==0){
if(isLablePage){
html = labelHtml+&#39;1&lt;/a&gt;&lt;/span&gt;&#39;;
}else{
html += &#39;&lt;span class=&quot;showpageNum&quot;&gt;&lt;a href=&quot;/&quot;&gt;1&lt;/a&gt;&lt;/span&gt;&#39;;
}
}else{
html += &#39;&lt;span class=&quot;showpageNum&quot;&gt;&lt;a href=&quot;&#39;+htmlMap[p]+&#39;&quot;&gt;&#39;+ (p+1) +&#39;&lt;/a&gt;&lt;/span&gt;&#39;;
}
}
if(eFlag ==0 &amp;&amp; p == thisNum){
downPageHtml = &#39;&lt;span class=&quot;showpage&quot;&gt; &lt;a href=&quot;&#39;+htmlMap[p]+&#39;&quot;&gt;&#39;+ downPageWord +&#39;&lt;/a&gt;&lt;/span&gt;&#39;;
eFlag++;
}
}//end if(p&gt;=(thisNum-displayPageNum-1) &amp;&amp; p&lt;(thisNum+displayPageNum)){
}//end for(var p =0;p&lt; htmlMap.length;p++){
if(thisNum&gt;1){
if(!isLablePage){
html = &#39;&#39;+upPageHtml+&#39; &#39;+html +&#39; &#39;;
}else{
html = &#39;&#39;+upPageHtml+&#39; &#39;+html +&#39; &#39;;
}
}
html = &#39;&lt;div class=&quot;showpageArea&quot;&gt;&lt;span style=&quot;COLOR: #000;&quot; class=&quot;showpageOf&quot;&gt; &#39;+(postNum-1)+&#39; páginas&lt;/span&gt;&#39;+html;
if(thisNum&lt;(postNum-1)){
html += downPageHtml;
}
if(postNum==1) postNum++;
html += &#39;&lt;/div&gt;&#39;;
if(isPage || isFirstPage || isLablePage){
var pageArea = document.getElementsByName(&quot;pageArea&quot;);
var blogPager = document.getElementById(&quot;blog-pager&quot;);
if(postNum &lt;= 2){
html =&#39;&#39;;
}
for(var p =0;p&lt; pageArea.length;p++){
pageArea[p].innerHTML = html;
}
if(pageArea&amp;&amp;pageArea.length&gt;0){
html =&#39;&#39;;
}
if(blogPager){
blogPager.innerHTML = html;
}
}
}
&lt;/script&gt;
&lt;script src=&quot;/feeds/posts/summary?alt=json-in-script&amp;callback=showpageCount&amp;max-results=99999&quot;; type=&quot;text/javascript&quot;&gt;&lt;/script&gt;

Então clique para salvar, não adianta tentar visualizar o blog, por que o código não funciona na visualização. Provavelmente no final da pagina do seu blog apareceu algo assim: