All plans include unlimited team members and outside collaborators, so you can bring in clients, architects, and subs without extra licensing costs.
1. In the People tab (scroll right if it's not visible in the ribbon), click "+ New" and select "Invite New User."
2. Fill out their contact information and select a role type.
3. To add an existing user to another project: go to that project, repeat the steps above, and choose "Add Existing User" instead of "Invite New User."