To manage users, tap on the desired Smart Lock in the Nuki app and enter the lock settings. Then go to “Manage users”. Then you can see the already authorized users and you can edit them, or invite new people to access your Smart Lock. If you have a Nuki Bridge, this even works from afar.
To invite persons to your Nuki in an instant, you can also open the menu (top left) and choose “Invite person”.