Follow the usual change process:
Now apple account security system upgrade, generally need to agree with the agreement or the company’s closely related personnel to operate. Except for people like me who use an iPhone.
That I use Win7 computer how to operate?
Log in to your Apple Developer account,
Enter the following management account address: appleid.apple.com/account/man…
This allows you to add trusted mobile phone numbers.
Verification can be completed.