[anupam_luv]

For VB4 Forum just make the following changes

In postbit find

<span class="usertitle">
{vb:raw post.usertitle}
</span>
<vb:if condition="$post['rank']">
<span class="rank">{vb:raw post.rank}</span>
</vb:if>

and after that write

<!-- Custom -->
<vb:if condition="$post[field7]">
<div class="usertitle">
Latest Blog: <a href="{vb:raw post.field9}">{vb:raw post.field8}</a>
</div>
</vb:if>
<!-- Custom -->

Field7 represents :Site RSS Feed .
Field8 Represents : Last Feed Title
Field9 Represents : Feed URL

Also in sitefeedcron.php file, apart from making the neccessary changes in field names
Search the word "userfield" and append the prefix to ur table to it e.g. vb_userfield
Then make it run via "Schedule Tasks" (By adding a new schedule task)... Thats it.