How to put cc hat into game using Sims 4 Studio

I made a Blender model I want to use as a hat in the Sims. To be specific, it's a model of the Jack in the Box mascot's head, because I want to create a Jack in the Box sim. I've got the model fully finished in blender, but how do I get it into the game through Sims 4 Studio? Like, what do I save it as, where do I put the file when I do save it, and how do I put it into my game? Sorry this is such a broad question, I'm very new to this program and very bad at technology. I literally accidentally deleted all of my sims save files trying to do this, if that tells you anything. (Don't ask how; it's a long story). So yeah explain this to me like I'm 5.