Only the Discord accounts listed here can sign in. Link an account to a member so it can edit that member's profile. To find someone's User ID, turn on Developer Mode in Discord, then right-click their name and choose Copy User ID.
Put the audio in this folder of the repo (it has to be inside sounds/music/), then choose the same files here so the site can read their names and lengths.
Nothing is uploaded and no storage is used. Each file can be up to 25 MB, and they start playing once you push them to GitHub.