You take the folder of the game you want and put it into games folder of PP7

In order to do this you must choose a game to replace
Then you fill out the game Info such as: the folder name, and the name of the game's swf. You fill this out in "PP7/games/PartyPack/content.json"
You will also need to drag in any video files for the menu and localization for yourself

Localization needs to be changed manually. Same needs to be done to add videos. For older packs you may need to convert mp4 files to usm. There is no way to insert new games into the list so you must replace one.