You can reset your password inside the application:
In Settings - Account settings - Reset password (3.64.507 and newer app versions, update to the latest)

A password reset link will be send to the email address you created your account with. 
Note: It may take some time (in rare cases up to several hours) until you will receive the email. Please check the spam, junk or other email folders, if you can’t find the email. If you did not receive the email, resend it in the Change password setting in Sports Tracker app.

Follow the instructions described in the email to create a new password.

You can request a new password on login page in app or from here