If you are using B2rvo version <= 1.10.x:

to add more blogs, copy the part between:

=== START OF BLOG C ====

and

=== END OF BLOG C ===

and paste it after this last line. Then you want to change:

$blog = 4;		// Linkblog now
$Blog_roll = Blog_get_by_ID( 4 ); // Blog roll

to the blog number you want to display (change "4" into something different).

In a similar way you can add as many blogs as you want, but the list will tend to grow huge.

Good luck