The user you’ve invited will get an email from
firstname.lastname@example.org with a link to accept the invitation.
User permissions in Tugboat are handled on a per-project basis. When users have access to a project, they have access to all the repositories within that project. When inviting users to your project, consider whether any of your repos contain sensitive data; you may want to split those repos out into a different project, where only a subset of users get access.
Go to username -> My Projects at the upper-right of the Tugboat screen.
Select the project where you want to add the user.
Click the Project Settings link to the right of the project’s title.
In the Invite a User to This Project section, add the recipient’s email address, and select the appropriate user type from the drop-down.
Press the big blue Invite button!
If the user doesn’t see the Tugboat invite: