Does each sub-user have their own password OR do they share the primary password?

How do I reset pw for sub user?

Please note that sub-user accounts are different independent account. As master user you can only add sub-user account and share your form with sub-user but you will not have any access to sub-user account. 

Unfortunately it is not possible for you to reset sub-user account password. Your sub-user can reset account password by clicking on the forgot password link which is in "Sign In" window. Password reset instruction email will be sent to account profile email address of sub-users.

Do get back to us if you have any questions.