Boost For Lemmy

I'm a user that's migrating from Reddit. Most of my fap material was on Reddit and I'm trying to find the lemmy equivalent communities but seem to hit a wall each time via boost. I tried searching for communities without logging in and saw a few but obviously couldn't access without an account.

Made an account in a random instance to turn NSFW on and now those communities don't show (404 community not found). Ok cool, I make an account in lemmy.nsfw but somehow I can't log into that instance here on Boost.

Help a brother out, how do I fap?