Users can be added from the team menu:
Specify the email address, Role and associated Groups to the new user.
Add any optional user filters. User filters enable row level security to filter out data. Read more about User Level Filters.
Invite the user. Once the user has accepted the invite, they'll see all their data assets (dashboards, datasources, queries, agents) shared to them or their group.
For further information on User Access & Permissions, please click here.