There are advantages to both but for simplicity's sake I'm going to have it combined with the mod itself. You have two options for implementing the injector: combine it with the mod itself OR create a second mod specifically for the xml injector. We will be working with two different files, one is inside the mod, the other is the example rewards store injector inside the examples directory of the modder's documentation. You never know when you'll need to start fresh. MAKE A BACK UP COPY OF THE MOD and put it where it will not accidentally get opened or deleted. I'll also presume you have this as your question pertains to this very thing. Second, and one I should have mentioned in my previous post, is you'll need to have Scumbumbo's XML Injector, as well as the modder's documentation. Given that you were able to navigate the mod you wish to change, I'll presume that this understanding exists.
First off, it is imperative that you have a basic understanding of how to use sims 4 studio to create and modify override packages.
