It's saying my iTunes cars is inactivated invalid after I had paid for it I have the receipt and I don't know how to email iTunes or what the **** I'm doing
Are you able to take it back to the store that you bought it from and ask them to activate it properly ? If not then you will need to try contacting iTunes Support (you will probably need to give them images of the front and back of the card, and possibly its receipt) : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then iTunes Cards And Codes