1. Open Today on the Apple Watch
2. Tap on the habit you want to check-in to open the detail view of the habit
3. Tap on the circular progress bar that appears to check-in
If you are experiencing problems with this process please try removing Today from the Apple Watch memory:
1. Press and hold the side button (the button just below the Digital Crown) until the shutdown screen appears.
2. Let go of the side button, then press and hold the Digital Crown.
3. Open Today on the Apple Watch