It’s okay! Just found out about this too.
So 1.You need to install tampermonkey extension to your browser of choice(if I understood correctly, it is the thing that manages your scripts and it’s using them on wanikani)
2. To your tampermonkey install Installing Wanikani Open Framework wanikani open framework. (My guess is that it’s some type of api)
3. To your tampermonkey install [Userscript] Wanikani Leaderboard. It’s the main script of leaderboard.
After all that, on your dashboard you’ll notice new window, it says “Leaderboard”, then you can add me there by pressing “+” and writing down my username “ddata3”
Hope it’s not too confusing, I’m new here too.