There are a few ways to mod Diablo 3 on PlayStation 4. One way is to use the game’s built-in mod tools. Another way is to use a third-party mod tool. The third way is the easiest and most common way to do it. To start, open the game’s main menu and select “Options.” Then, under “Gameplay,” select “Modify Game Content.” Next, click on the “File” button and browse for the file you want to modify. For example, if you want to add a new class into Diablo 3, you would browse for the file called “Classes.” Then, click on it and select “Modify.” When you’re finished modifying the file, click on the “OK” button and then close the game’s main menu. reopened it and your modifications will be applied.