Can't accept a player on a game

Hey guys, Just wondering if someone could help me with this problem. An error appears whenever I try accepting a member to our game. I'm the second GM for our game and everytime I try to accept the member, it keeps showing a small window with an "403 Error" on it. I've just recently started using this site and I'm still not familiar with it

I believe there are a few bugs around the permissions system and 'second GMs'.
Only the primary GM can do certain task and accepting players is one of them.

Alright, thank you so much

I think a mod may be able to help you.