You have an account and want to know how to change the address in AdSense. When you created your G-mail account you didn’t enter the right details or you move from the place where you used to live is a few options I can think of
When you earn a sum of $10 you can fix it. I think AdSense gives a chance to check and correct that information of mine before verifying my ID ( Identity ) and PIN ( Address ).
FIRST, Login to your dashboard and click on the Payments option
SECOND, Under Settings click on the manage Settings text
LASTLY, In payments profile look for Name and Address option and click on the Pen or Pencil symbol.
After entering your address and click on the Save button