how do I add a repo

[Hiori555]

I've tried a lot of manga readers, but Houdoku seems to be the best in terms of reading, but it's very limited in terms of source. I want to add this repo https://raw.githubusercontent.com/keiyoushi/extensions/repo/index.min.json to Houdoku, how can I add it?

[Hiori555]

I've come this far but I don't know what to change or what to do. I don't understand software