I am using the Free Version of GitHub. May I know the steps and suggestions for how to grant a specific user who I invited to access to my GitHub secure repository?
Step 1: On GitHub.com, navigate to the main page of the repository.
Step 2: Click the Settings under the repository name.
Step 3: Click the Collaborators & teams option in the Access section of the sidebar.
Step 4: Click the Add people or Add teams option at the right of Manage access.
Reference: Managing teams and people with access to your repository