If you would like to change the method of authentication on your account, you will need to deactivate the current authentication method and enable with your desired authentication method.
A useful guide on how to disable your 2FA can be found below. If you have enabled via:
Authenticator Application - CLICK HERE
SMS - CLICK HERE
Email - CLICK HERE
Once the current authentication method has been disabled, you may now enable via:
Authenticator Application - CLICK HERE
SMS - CLICK HERE
Email - CLICK HERE