PD is an anonymous P2P app. There are English guides (google) but basically download and unpack the English version, open a port in your firewall/router for it and dedicated 100GB or more to the unity cache thing. Then start setting up search terms on the search tab and downloading.
Use studio codes, names and generic stuff like "U-15" for searching. You can also enter parts of words like "199" for anything with 199x in the name. You can nest searches as well, which is handy because some terms will hit the limit of 1000 results. It takes time for results to come in, so you can leave it for a few hours to build up if you don't find what you want at first.
In the results there is a number that starts at 1. Over 1 is good reviews, under 1 is bad reviews. Fake files get bad reviews. Beware of archives like .rar, they are often password protected. Stick to .avi and .mpg.
Just be careful, there is some dodgy stuff on there as well as the vast majority of good stuff. It's also good for AV, random TV shows and particularly older stuff. There are loads of old VHS rip IVs, for example (which tend to be fully nude and uncensored so check thet are 18+ before downloading).
PD downloads relatively slowly. To be anonymous it actually downloads random stuff into the cache just for sending on to other people. Be patient, you need to leave it running for many hours at least, days preferably. If you find interesting stuff you can post the hash codes here for others to get. I recently finished grabbing some Nozomi stuff I need to check and maybe post if I find the time, but it's hard to keep track of what is already up on AO.