If you forget your password to ZMS it is possible to reset your ZMS password by pressing the "Forgot your password? Reset my password" on the log-in screen. This will give you a field to enter your email, once enterred it will send you a password reset email.
This will send you a password reset email and you should be able to access your environment again.
Keep in mind a password reset link is only active for 24 hours before they expire.