I cannot create a Pull Request! Please can you advise.

I cannot create a Pull Request! Please can you advise.
I am following the guide on here https://services.github.com/on-demand/github-desktop/pull-request-github-desktop

But when I get to step 4. the branch I created i.e. the compare branch is not in the dropdown menu at all ?? so I cannot go any further?

maybe because you non change nothing on the code, so github cant create a pull request from “nothing”

Thanks for that enlightening remark. Of course I have changed something. Two files are changed and some of the changes shown in the screen shot.