I get an email saying my promotional balance will expire in June but it doesn't give me an option to use it to buy games.
When at the purchase screen of the game you are trying to buy, look down at the bottom of the page and it will say, change payment option "press X".
This will take you to a new screen where you can choose the account balance.
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It does not give me an option to change the payment to the remaining balance. It gives me the option to add or change credit cards but nothing about using my credit balance.