The orange T Login button sits on the title screen. If it's missing, your device has probably opted out of data sharing, which hides the login.
- Update to the latest version.
- Open Settings and tap Data Opt-In.
- Tap Accept on the terms.
- Go back to the title screen and tap T Login.
Moving to a new device? Do this on the old device first, log in with your email, and play one full day until the receipt shows Saved to Server. Then follow Transfer data between devices.
Important: Opting out of data sharing, Erase Data and Delete Account permanently delete your save from our servers. These can't be undone.