Hi there! I understand you're having trouble linking another medical account in the healow app on your Mac with OS X 10.15.7. Let's get this sorted out together.

To start, could you tell me a bit more about what happens when you try to link the other medical account? For example:
- Are you seeing any error messages?
- At what point in the process does it stop working?
- Have you already tried adding the account using the plus (+) symbol and "Add New Account" option?

Once I know more about where things are sticking, I can guide you through some steps tailored for your situation.

Meanwhile, here’s a basic way to link another account in the healow app:
1. Open the healow app.
2. On the "My Accounts" screen, look for the plus (+) sign or the "Accounts" tab.
3. Tap on the plus (+) symbol.
4. Select "Add New Account."
5. Enter the username and password for the new medical account you want to link.

Make sure your app is updated to the latest version available for Mac to avoid compatibility issues.

If you’ve done all this already and it’s still not working, let me know what happened at each step, and we can delve deeper, such as checking account permissions or app settings.

Would you mind trying that if you haven’t yet and telling me what you observe?