You have to create a "fork" using the link in the top right corner on GitHub. Then in your fork you could edit master or work in a branch. Working in branches is better but for starters it doesn't matter. (And it never really matters to anyone other than yourself in any case.)
Also see
https://reflectoring.io/github-fork-and-pull/ (random page I just found; looks okay) and
http://koreader.rocks/doc/topics/Collaborating.html
Quote:
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the inbuilt keyboard doesn't have a % character!
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There is, under symbols with shift active.
I meant to use the existing template function (i.e., with %1, %2, etc.) but let's first await the PR.
