All I did was use the search tool in my instance and link the sub name to you with an '!' at the beginning. Sometimes the search function doesn't show up those subs, this only happens if nobody from your instance has ever tried opening up that sub before.

Seeing as how the piracy@lemmy.dbzer0.com sub has thousands of members, I'm surprised how not a single one of them are from lemmy.ml

Now that you've clicked on piracy@lemmy.dbzer0.com, you should be able to subscribe to that sub and engage like normal.