If you go to entities and find the user you would like to set the password for, there is a code snippet named, ChangePassword, that can be used to change the password of a user that already has a password assigned. It requests the current password before allowing you to change it as a security measure. This is the one you would typically use. Alternatively, there is also the service, AssignNewPassword, which doesn't require the old password before assigning a new one. This would be useful in fewer cases and would most likely be used for administrative purposes if a password was forgotten.