There are 2 contact entries related to your account and how you are seen by others:
Here's how you change each of them:
Click on the "Setup>Account - Contact Info" menu item and you will be taken to the change page.
Click on the "Setup>Contact - Reservation Info" menu item. En
If fields are left blank then the same field in the "Account - Contact Info" is used. This Reservations contact info overrides what is in the Account contact info.