To add a collaborator to your repository on GitHub, go the Settings tab.
Next, click Manage access (you may be prompted to enter your password).
From here, click on the green Invite a collaborator button. You can use the search bar to search for another user by username, full name, or email. When you’ve found the user you want to add, click the green button.
The user you’ve added should get an email inviting them to become a collaborator.
There are no exercises for this lesson.
Inviting collaborators to a personal repository – GitHub Help