In your site control panel there should be a mysql link and within that a phpmyadmin link to view databases
View your photopost settings table and check settings 171-173
Most likely since this is VB
you did not enter the cookie prefix in the place it asked on install
You can update setting 172 and make it bb. If VB
and Photopost are in the same database you can use the sql manager in VB
admin and enter this query but make sure to add any table prefix you have for photopost if different
UPDATE pp_settings SET setting='bb' WHERE id='172'