How do I change my Xbox 360 gamer profile picture?

I have some pics in my usb drive i wanna change my gamer pic.How do I change my Xbox 360 gamer profile picture?first you press the big button in the middle of the control that has a big green "X" on it. Then you press "a" as soon as it comes up and then you click on edit profile. Next you click on gamer picture and then select the gamer picture that you want

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