Navigate to the Rails repository you just pushed to (e.g. https://github.com/<your user name>/rails) and press "Pull Request" in the upper right hand corner.
Navigate to the Rails repository you just pushed to (e.g. https://github.com/your-user-name/rails) and press "Pull Request" in the upper right hand corner.
Write your branch name in branch field (is filled with master by default) and press "Update Commit Range"