How do I change the phone number I want to use for two factor authentication?
You can change the phone number you are using for two factor authentication by going to the User Settings page.
To navigate there, click on your Account name to reveal the ‘Settings’ drop down menu. Then click on your Username.
When changing the phone number you are using for two factor authentication, you will have to first delete the old phone number. Then go through the verification process again to add a new phone number. This step is prompted and required if you have two factor authentication enabled on your Account.