Re: How do you use a controller on a game compatible for one.

Most games you simply have to have a controller plugged into your PC, and fully installed by it.  Some games only recognize a certain controller, such as Xbox360 or Xbox1, but they usually state this somewhere.  Once you have an approved controller plugged up, if the game doesn't automatically use it, sometimes you just have to go into game options and select it.  I personally don't have battlefront, but this is how it works on Mass Effect Andromeda, Dragon Age Inquisition and most other games I have played.