Trus gimana donk caranya... caranya ini aku dapat dari OOm berikut adalah langkah2nya

1. login blogger

2. Masuk ke layout dan edit HTML

3. Download Ful Template... ini buat ngebackup template blog anda yang udah ada..

4. Lalu klik Expand Widget Template

5. Cari kode </head> lalu letakkan script dibawah ini diatas kode </head>

<script type='text/javascript'>
var thumbnail_mode = "float" ;
summary_noimg = 250;
summary_img = 250;
img_thumb_height = 120;
img_thumb_width = 120;
</script>

<script type='text/javascript'>
//<![CDATA[
/******************************************
Auto-readmore link script, version 2.0 (for blogspot)

(C)2008 by Anhvo

visit http://en.vietwebguide.com to get more cool hacks
********************************************/
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>

6. Cari kode <data:post.body/>

7. udah ketemu lom?? kalo udah ganti kode <data:post.body/> dengan kode di bawah ini
<b:if cond='data:blog.pageType != "item"'>
<div expr:id='"summary" + data:post.id'><data:post.body/></div>
<script type='text/javascript'>createSummaryAndThumb("summary");</script>
<span class='rmlink' style='float:left'><a expr:href='data:post.url'>READ MORE - <data:post.title/></a></span>
</b:if>
<b:if cond='data:blog.pageType == "item"'><data:post.body/></b:if>

Warna Merah dapat anda ganti dengan selain Read More misalnya baca selengkapnya....

8. Kalo udah beres terus di save deh....

Selamat Mencoba