1. Log it to your blogger and go to Design >> Edit HTML

2. First,download the present template as a backup.

3.Make sure you put check mark to “Expand Widget Templates

4.Find this tag by using Ctrl+F  <data:post.body/>

5. Paste below code after <data:post.body/> tag


<!--related post started-->
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<div class='similiar'>
<div class='widget-content'>
<h2>Related post</h2>
<div id='data2007'/><br/><br/>
<script type='text/javascript'>
var homeUrl3 = &quot;<data:blog.homepageUrl/>&quot;;

var maxNumberOfPostsPerLabel = 5;
var maxNumberOfLabels = 3;
maxNumberOfPostsPerLabel = 5;
maxNumberOfLabels = 3;

function listEntries10(json) {
var ul = document.createElement(&#39;ul&#39;);
var maxPosts = (json.feed.entry.length &lt;= maxNumberOfPostsPerLabel) ?
json.feed.entry.length : maxNumberOfPostsPerLabel;
for (var i = 0; i &lt; maxPosts; i++) {
var entry = json.feed.entry[i];
var alturl;
for (var k = 0; k &lt; entry.link.length; k++) {
if (entry.link[k].rel == &#39;alternate&#39;) {
alturl = entry.link[k].href;
break;
}
}
var li = document.createElement(&#39;li&#39;);
var a = document.createElement(&#39;a&#39;);
a.href = alturl;
if(a.href!=location.href) {
var txt = document.createTextNode(entry.title.$t);
a.appendChild(txt);
li.appendChild(a);
ul.appendChild(li);
}
}
<!--Bloggertrix.com-->
for (var l = 0; l &lt; json.feed.link.length; l++) {
if (json.feed.link[l].rel == &#39;alternate&#39;) {
var raw = json.feed.link[l].href;
var label = raw.substr(homeUrl3.length+13);
var k;
for (k=0; k&lt;20; k++) label = label.replace(&quot;%20&quot;, &quot; &quot;);
var txt = document.createTextNode(label);
var h = document.createElement(&#39;b&#39;);
h.appendChild(txt);
var div1 = document.createElement(&#39;div&#39;);
div1.appendChild(h);
div1.appendChild(ul);
document.getElementById(&#39;data2007&#39;).appendChild(div1);
}
}
}
function search10(query, label) {
var script = document.createElement(&#39;script&#39;);
script.setAttribute(&#39;src&#39;, query + &#39;feeds/posts/default/-/&#39;
+ label +
&#39;?alt=json-in-script&amp;callback=listEntries10&#39;);
script.setAttribute(&#39;type&#39;, &#39;text/javascript&#39;);
document.documentElement.firstChild.appendChild(script);
}
var labelArray = new Array();
var numLabel = 0;
<b:loop values='data:posts' var='post'>
<b:loop values='data:post.labels' var='label'>
textLabel = &quot;<data:label.name/>&quot;;
var test = 0;
for (var i = 0; i &lt; labelArray.length; i++)
if (labelArray[i] == textLabel) test = 1;
if (test == 0) {
labelArray.push(textLabel);
var maxLabels = (labelArray.length &lt;= maxNumberOfLabels) ?
labelArray.length : maxNumberOfLabels;
if (numLabel &lt; maxLabels) {
search10(homeUrl3, textLabel);
numLabel++;
}
}
</b:loop>
</b:loop>
</script>
</div>
</div>
</b:if>

<!--related post end-->

* If you want to add more post , change the value of   maxNumberOfLabels
* If you want to add more label, change the value of   maxNumberOfPostsPerLabel

6. Now click save template you are done.
RSS Feed adalah informasi sindikasi yang dikirim melalui teknologi feed dari situs web untuk pengguna Internet. Pengguna dapat berlangganan feed dari berbagai situs web, dan kemudian informasi baru dari situs-situs yang dikirim langsung kepada mereka melalui aplikasi pembaca RSS.  



Hal ini mirip dengan menerima e-mail. Aplikasi pembaca RSS bertindak seperti "kotak masuk" untuk RSS feed. Daripada harus memeriksa beberapa situs Web untuk update, informasi baru terletak di satu tempat yang nyaman. Penggunaan RSS feed telah meningkat sebagai blogging telah menjadi lebih populer.

Click LAYOUT > ADD A GADGET > HTML/JAVASCRIPT

Now add the code from below to it and save it.


<script style='text/javascript' src='http://blogergadgets.googlecode.com/files/recentpostswidgetv1.js'></script><script style='text/javascript'>var numposts = 5;var showpostdate = true;var showpostsummary = true;var numchars = 100;</script><script src='http://yourblogname.blogspot.com/feeds/posts/default?orderby=published&alt=json-in-script&callback=showrecentposts'></script>

As now just replace red codes in above codes with your script url and the number 5 is the no of posts to be displayed and last red is your blog url.nuchars=100 is for post desription.