how to log out of the store on the nokia lumia 820?!?!?!?

I have a nokia lumia 900 and the account I made was in U.S meaning every app was in $ instead -_- which was very annoying. I did some research and found I had to reset the phone to be able to reset the app store (MarketPlace) really annoying. But that is the only method I have found because the store is integrated into the phone. Unless other answers tell you otherwise this is the only method I am aware of. Please wait for more answers before doing my answer, because you don't want to end up resetting your whole phone for nothing.

P.S don't forget to change the account before you reset your phone