From b2evolution manual

Display long description of the blog. This long description can be edited by the blog owner in the admin interface under 'Blog Settings > General > Long Description.

[edit] Example

<source lang="php"> <?php

 $Blog->longdesc( array(
          'before' => ' ',
          'after'  => ' ',
          'format' => 'htmlbody'
   ) );

?> </source>

[edit] Parameters

Name	Default	Usage
before	(1 space)	Displayed before long description of the blog.
after	(1 space)	Displayed after long description of the blog.
format	'htmlbody'	Format to output.

[edit] Return value

This tag displays content only, it does not have a return value.