If you wish to change your mobile device or authenticator app used for 2FA, you may do so by following these steps:
Step 1 and 2: Go to the dropdown top right hand corner which contains your name, and click on “My Account”.
Step 3 and 4: Click on “Security Settings” tab, go to 2FA Settings and click the “Change Settings” button
Step 5: Opens 2FA set up in a new tab. Click on the Delete Icon.
Step 6: Set up using your new device or authenticator app.