How to pay my monthly bill in iPhone 5s?

My boyfriend showed me the other day a way to pay my bill for my iPhone 5s AT&T. He went to settings and somewhere he chose pay my bill! He told me to do this every month. I'm afraid to ask him again because he might get mad at me. Would you please tell me where to go after settings?!

You're afraid to ask your boyfriend a question incase he gets mad at you. WOW that says a lot.

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