I know similar questions have already been asked.
But, I believe my issue is due to a mistake I have previously made and therefore is different: let me explain.
As Matt Clark stated above
However, origin might not be set, so skip the deleting step and simply attempting to add can clear this up.
git remote add origin <"clone">
Where "clone" is simply going into your GitHub repo and copying the "HTTPS clone URL" and pasting into GitBash