How does this work? Could you elaborate on how to use those sites a bit? Thx

If you're looking for scene releases, just use a pre database like preDB.com. Find a release on preDB, copypasta the release name to binsearch, create the NZB, done.

Generally speaking it's very easy to find material just using binsearch. If you want a 1080p copy of a particular film, just search for the film name along with '1080p' and you're almost guaranteed to get relevant results on the first try.