You can only control your appliance with any device (smartphone/tablet) where the App is logged-in with the same account.
Otherwise, If you desire to share your appliance with other different user, you need to:
- Open the APP logged in with your personal account (user-A) on your smartphone
- Tap the right side icon on overview page to access personal section
- Enter device sharing section
- Insert the user mail account (user B) you want to share the appliance with.
- Tap “confirm” to send invitation
User-B will receive a notification on his APP and a new device will be present on his APP overview page