From 'Users & Groups' --> 'Users' --> 'Create new' you can add new users to the account by filling in the name and email address. The new user will receive an email to set a password for his account.
You can also change the role of a user or add them to a specific group.
From 'Users & Groups' --> 'Groups' --> 'Create new' you can create or remove groups.
Click on ‘Next step’ and choose the users you want to add to the group and the meeting type you want to connect with the group.
Groups help you have different types of meeting assigned to different users.