I opened and it said to use a repo tab. There are no tabs so I pushed a button. It had a list with Linux so I clicked that. It redirected to a 404 page on github and I gave up.
I don’t know what this is supposed to do, let alone how to use it. But I looked at it for you!
There's a menu bar on the left in which the third option is labelled repository, no?
firefox 150 here.