nostr:npub1l2vyh47mk2p0qlsku7hg0vn29faehy9hy34ygaclpn66ukqp3afqutajft I am trying to use highlighter while actively learning the Rust programing language…

Where is the highlighting feature in the website? I am looking at the "Highlighter" tab, and all I can see is current highlights…

Also, is there a manual somewhere explaining how to use that app?