You can at any time choose to unlink one of the services you have linked to your WiZ account.
To do so, open the settings of the WiZ app, and tap again on the account you want to unlink. For example, if you are currently signed in with Facebook, tap again to unlink.
Note: we do not recommend unlinking all accounts at once, since this may force you to re-create your home if you were to reinstall the app or change your phone.