well you can these steps below to switch the integration but it is still not going to get you past the issue your posting here which is entering incorrect information in the config
1. Edit the settings table of Photopost settings 41,83,171-173 and set to the proper integration type forum mysql table prefix and cookie settings. Edit 165 and set to the name of your SMF cookie name
2. Edit your config-inc.php file of Photopost and enter in user database the proper vbulletin mysql info.
3. In your usergroups table of Photopost delete all entries except Administrators where that one you want to edit it and change the groupid from 5 to 1