First, ensure you have created an account. Account creation instructions are provided here
Open your Mysa App, select 'Login'.
This will open your login screen, type the email address you used to set up your Mysa account and password.
Ensure you are case sensitive with both your email and your password.
If you have entered all information correctly, your app will open to your "add thermostat" screen.
If you cannot remember your password, simply select 'Forgot Your Password?'. A link will be sent to the email associated with your account to easily reset!