@EllyJ go to github on the original project
push the fork button top right. now u have a copy, and ‘could’ submit changes back to the author as ‘pull request’, pull from your repo back to his.
now, rename your current module folder
and then git clone your fork, and do npm install if the original asked for it
now, copy the changed files from the renamed folder to the new one.
if all is good
then we can work on getting the changes pushed up to your fork