Past the copy of your entire game into that document and label it whatever you want so you know what is in that file. Right click copy and create an empty folder on your desktop. Step 1: The first thing you need to do is go into your documents under Electronic Arts and click on The Sims 4 file. Here is how to install mods onto your game. However, not everyone is a wiz at computers. Mods are easy to use once they install in the game. Here is an easy example step by step process to installing mods for Sims 4.