Hi there! I see you're mentioning that something "does not work," and you'd like a troubleshooting guide for the HeartBit app. To help you best, could you tell me a bit more about what exactly isn't working? For example:

- Is the HeartBit app not opening or crashing?
- Are you having issues syncing your data or device?
- Are certain features or tiles (like heart rate monitoring) not displaying correctly?
- Any error messages you see?

Knowing these details will help me guide you more precisely.

In the meantime, here are some general first steps you can try on your Windows WebKit device with HeartBit:

1. Restart the HeartBit app: Close it completely and reopen.
2. Restart your device: This can clear temporary glitches.
3. Check for app updates: Make sure HeartBit is the latest version.
4. Check your internet connection: A stable connection is needed for syncing.
5. Verify device compatibility and settings: Sometimes settings like Bluetooth or permissions affect the app performance.

Once I have more info from you, I can provide tailored troubleshooting steps or deeper fixes if needed. How does that sound?