During registration, users can opt into optional groups such as mailing lists and can also be automatically added to mandatory groups, for example to help with identification. MSL will handle the configuration, so please contact support@ukmsl.com with the group IDs for any optional and/or mandatory groups, and which registration page(s) you'd like them added to.
You can access this feature from your MSL System Admin site. Only Super Admins with Site Admins permissions can access the Registration Pages windows, and only MSL has the permissions to update the fields.
For further information, see Registration Pages and How to Locate a Group's ID Number.