I forked a repo, added new branches and have currently some open pull requests.
Now I have done something wrong inside a branch and want to re-fork it from the original.
How can I do this? I can not remove the whole fork because of the open pull requests.
I am a newbie and until now, I did everything on the github web page. Now I have downloded the 'Github Desktop' software, but it seems that this tool is not helpful for that.