Please open ‘Settings’ of the organisation and click on ‘Members’ on the left menu bar.
Then click on a button Invite and enter an email address of the person you want to invite and choose a role of the person in the drop-down list. There are three roles in the organization: Owner, Manager, Member. Users with different roles have different rights.
Note: Users already registered will be added automatically. Otherwise they will receive an invitation email.
At the moment invitations can be sent only to email addresses on bricksapp.io domain.