Head to Settings → Team. Click 'Invite member' and enter their email. Choose a role: Owner, Manager, Front Desk, or Housekeeping.
Roles control what the team member can see and do. Front Desk members see reservations and guest messages but cannot change rates or billing. Housekeeping sees only the housekeeping board.
Invitees receive an email link. Once they accept, they appear in the team list and can be assigned tasks.