These instructions will help you reset your password if you are using the Sheep App (SheepCRM users can reset their password from the login screen)
Click Sign in
Request a reset link
Enter the email address that was registered
Check you email, follow the link in the email. If you don't get an email double check that your email address was correct. Finally try re-registering with that email address (there may have been a typo in your original registration)