[The Bad Astrono]

Well, I'm finally getting around to working on this, and I'm having a problem (probably due to my lack of Db skills).

I moved my website and blog to the same server as the vB board. They use two different databases, which is unavoidable. This means the admin for the two databases have different names. When I try to post, I get an error which says:

WordPress database error: [Access denied for user 'XXX @'localhost' to database 'xx vBdbname xx']
SELECT count(*)-1 FROM vb_forum.post WHERE threadid = '3'

where XXX is my admin name on WordPress, and "xxvBdbnamexx" is the database name for the vB board. It looks to me that the admin for WP cannot talk to the database for vB. I tried adding the WP username to the forum database in DirectAdmin (the panel I use for administration) but it won't allow me to (it forces me to use a prefix for the name specific to the database, so I literally cannot get the same admin name for both databases).

If this makes any sense :-) does anyone have a suggestion?

Thanks.