Well, the actual patch is available here:
As for how you do it? Judging from the stuff he's talking about, you need to jailbreak your PS4. Which has advantages and disadvantages.
Advantages include being able to install stuff like emulators, mods, homebrew, and such, as well as make and play backups of your games (and of course also games you not so legally downloaded from the not so savory parts of the web).
Disadvantages include losing access to all of the online functionality. No playing multiplayer games unless local. No buying on the online store. No updating your PS4, or your games. I mean, technically, you can still go online, but you'll get banned with no refunds. Also, messing up the jailbreaking process can brick your console. And I guess it voids the warranty.
Not to discourage you, but unless you want to pirate, or you're a homebrewer or someone like McDonald who like tinkering under the hood, there is not a lot of reason to jailbreak as a regular user. So you need to ask yourself whether you really want to essentially sacrifice a PS4 Pro to just serve as a device to play modded Bloodborne.