You really aren’t helping anyone help you.
That video looks terrible.
I watched the beginning. I got as far as where he is editing the git config file manually in Atom to add the remote repository on github.
That should work, but it is not the recommended workflow.
I am able to clone a github repo using the github plugin.
I type “git clone” into the command pallette, select “GitHub clone”
…and am then prompted to put in a repo URL.
Note, this did nothing in my open project. It did however clone the repo on my filesystem, which I could then open in Atom.
Do note, for git and github features to work in Atom, the repo must be the top-level folder in your project.