First the "why":
Finalizing cases is important for many reasons, you can read more about why you want to finalize cases on our blog.
Now the "how":
The very last step when you're finishing up a case is to review everything on the "Final Report" page and click the button at the top to add your signature.
Click "Final Report":
Click the "Add ____ Signature" button at the top:
Sign with your finger and click "Finalize Report":
Now, when you go back to your calendar, you'll see the cases showing up in green on your calendar instead of red:
