Create a new Branch
A new branch should always be created from an up to date
That's why you added the BetonQuest repository
Now click on your current branch in the bottom right corner, probably
Then you click on
upstream/main and click on
New Branch from Selected....
Now give the branch a name that describes the changes you want to make and click
Now you are ready to make your changes! Either change Docs or Code, depending on your skills.