Help forum urgent lol

Hey, Iam running vBulletin 3.5.4 and i downloaded vBplaza and vBux off vBulletin.org i installed it and now it doesnt matter what usergroup ur in it says ur usergroup doesnt have permission to buy vBplaza items can someone help

Edit the settings for it in admincp.

change the group setting in admin panel.

ive tried that

Axel also when i try to see a thread some writing comes up lieke this:

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.