When you edit a file in another user's repository, we'll automatically fork the repository and open a pull request for you.

  1. In another user's repository, browse to the folder that contains the file you want to edit. Click the name of the file you want to edit.
  2. Above the file content, click . At this point, GitHub forks the repository for you.
  3. Make any changes you need to the file. New content in file
  4. Above the new content, click Preview changes. File preview button

  5. At the bottom of the page, type a short, meaningful commit message that describes the change you made to the file. You can attribute the commit to more than one author in the commit message. For more information, see "Creating a commit with multiple co-authors." Commit message for your change

  6. Below the commit message fields, click the email address drop-down menu and choose a Git author email address. Only verified email addresses appear in this drop-down menu. If you enabled email address privacy, then username@users.noreply.github.com is the default commit author email address. For more information, see "About commit email addresses." Choose commit email addresses

  7. Click Propose file change. Commit Changes button

  8. Type a title and description for your pull request. Pull Request description page
  9. Click Create pull request. Pull Request button

Further reading