Tina: Not doing anything wrong. Just sit in the tent with the pouch. Try to entice him out with treats. If he doesn't come out, stay in for about half and hour and try again the next day. Take it slow. Crabbing can be scary, you'll get used to it soon though. =]
Also do you just have the one? Gliders should always be kept in pairs. So try to get him a cagemate soon. If you get one that wasn't housed with him previously, you'll have to go through quarantine. Post a new thread with any questions and we'll be happy to help! Welcome to the boards!