I googled the title and read the forum but couldn't reply to the forum without subscription and $$$. (another reason why WebmasterWorld rocks! )
anyway, I followed the instruction as follows:
Manually create new templates to increase the forums displayed. You have to add template forumhome_forumbit_levelx_post and template forumhome_forumbit_levelx_nopost for each level past 2, replacing the x with the level number. For instance:
forumhome_forumbit_level3_nopost forumhome_forumbit_level3_post etc.
Copy the contents of the other templates ('1' or '2') into these new templates. Then change the 'Depth of Forums' setting in the Admin CP to the appropriate number.
I did exactly what it said, is there any other step I need to take? I am new to vBulletin.