I open my profile and it says I am logged on as a guest.When I press it, it asks "Unlock the full version" I press unlock. I am then taken to "Confirm Your In App Purchase. I press "Buy" It then says "You Cannot Purchase ?This You must purchse the app that this item is for before you can purchase the item.
That sounds strange! Which country are you trying to buy from? What *should* happen is that once you press 'buy' you enter your iTunes account name and then get a confirmation (if the iTunes store allowed you to purchase it).
Just to double check – you have a valid iTunes account, right?