If you've forgotten your password, you can reset your password through the login screen within the app.
1) Click the "More" option at the bottom right of the home screen.
2) Select "Sign in with your purchase email."
3) Select "Forgot password" under the login fields. You will be prompted to enter the same email address you used to sign up for the account and then you will receive a link to reset your password.
If you do not see the "Forgot Password" link, be sure you have updated to the latest version of the app.