Global Variable appearing in GUI (SOLVED)

I want to make a sort of non-physical credit system for my mod. I want to make it so you can click on certain blocks that will take you to a store where you can purchase items using those credits. I made the credits a global variable so even if the player exits one of these stores, they'll still have the same amount of credits when they come back. However, I also want to make it so you can actually see the amount of credit you have while you're in the store GUI. I don't know how to do this, so if someone could tell me how, that would be a great help! Or if there's an easier/better way to do this whole system, I'm also open to hearing that!