In-App Purchases

Extremely good game, worth the money, except for the part where I can’t acess the in-app purchases page. Is there something wrong with my computer, or am I just plain stupid? I think I checked all of the menus, but I could be wrong. I have a 1/2 year old MacBook pro with plenty of storage and no other known problems. Thanks for the help.

Ebwieg about Civilization® V