Initially I was getting
error: The requested URL returned error: 403 Forbidden while accessing https://github.com/..
$ git push origin master
I read a forum post that recommended
$ vi .git/config
and changing the url line from https://github.com/.. to ssh://github.com/..
and then generating public/private keys and adding this to github. After doing so I was getting
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
eventually I solve this by changing that url line in .git/config to
url = firstname.lastname@example.org:LOGIN/REPONAME.git
... I also made sure to run
git config --global user.name "LOGIN"
git config --global user.email EMAIL