Depending on your settings, you might be taken directly to the Profile page (if so, skip to step 5 now), or you might be taken to the “Help us protect your account” page (if so, click Next or I already have a code).
Enter the security code that you received, and then click Next.
On the Profile page, click edit profile. Make changes to your billing account information, and then click Save.
Console steps: Change your account address, email or phone number
On your console, sign in using your Xbox Live gamertag.
Go to Settings and then select Account.
Go to Your Information, and then select Billing Information.
Enter your Microsoft account password, and then select Sign In.
Edit your billing account information and then select Done.
If you want to change the billing name on your Xbox Live account, use the Computer steps above.