How to Add Readmore in Blogger

Go to Blogger.com And Follow these Steps - :

Step1 : Go to Template  and click on EDIT HTML 

Step 2 : Find </head>

Step 3 : Put This code above </head>

<script type='text/javascript'>
var thumbnail_mode = "no-float" ; 
summary_noimg = 400;  /* Summary length if no image*/
summary_img = 300; /* Summary length with image*/
img_thumb_height = 200; /*Image Height*/
img_thumb_width = 200; /*Image Width*/
</script>

<script type="text/javascript">

function removeHtmlTag(strx,chop){ 
 if(strx.indexOf("<")!=-1)
 {
  var s = strx.split("<"); 
  for(var i=0;i<s.length;i++){ 
   if(s[i].indexOf(">")!=-1){ 
    s[i] = s[i].substring(s[i].indexOf(">")+1,s[i].length); 
   } 
  } 
  strx =  s.join(""); 
 }
 chop = (chop < strx.length-1) ? chop : strx.length-2; 
 while(strx.charAt(chop-1)!=' ' && strx.indexOf(' ',chop)!=-1) chop++; 
 strx = strx.substring(0,chop-1); 
 return strx+'...'; 
}

function createSummaryAndThumb(pID){
 var div = document.getElementById(pID);
 var imgtag = "";
 var img = div.getElementsByTagName("img");
 var summ = summary_noimg;
 if(img.length>=1) { 
  imgtag = '<span style="float:left; padding:0px 10px 5px 0px;"><img src="'+img[0].src+'" width="'+img_thumb_width+'px" height="'+img_thumb_height+'px"/></span>';
  summ = summary_img;
 }
 
 var summary = imgtag + '<div>' + removeHtmlTag(div.innerHTML,summ) + '</div>';
 div.innerHTML = summary;
}

</script>

Step 4: Find   <data:post.body/>  (if there is more than one occurence replace all) and replace it with the following code  

       <b:if cond='data:blog.pageType == &quot;item&quot;'>
<data:post.body/>
<b:else/>
<b:if cond='data:blog.pageType == &quot;static_page&quot;'>
<data:post.body/>
<b:else/>
<div expr:id='&quot;summary&quot; + data:post.id'>
<data:post.body/>
</div>
<script type='text/javascript'>
createSummaryAndThumb(&quot;summary<data:post.id/>&quot;);
</script>
<div style='clear: both;'/>
<div align='right'>
<div class='jump-link'><a expr:href='data:post.url' expr:title='data:post.title'><img alt='Read More..' src='https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDrQH6cZmkCD9mQ-MbJF4IwQZD3DhoelPT4QTDsKHqXs8_9vCJFzYsjRSEDZOtMvm199LgGDOzDGFOc2Don3B5N9fKqzKwAdu5ePcCHdhBI98zQ0xV5opQXI386i-g2LPhdgHbETKcv9g/s1600/1x1juice.png'/></a></div></div>
</b:if>
</b:if>

You are done!!!!