I am trying to make a simple FPS using the FPS Controls Prefab on a simple terrain but when I go to game view and play, I cannot walk or look around. What is wrong?
I'm not sure what you're doing or not doing, or what error messages you're getting (if any). As a result, I'm just going to assume you've never used the game window before, and/or the FPS controller.
1- Press the Play button near the top of the editor.. (it's the sideways triangle).
2- If that's not solving the issue, then click in the game window with your mouse while the play mode is active (meaning you pressed that play button).
3- Walk forward using the W keyboard button, look around by sliding the mouse around.
If those don't solve the issue, we'll need more info regarding whatever is happening/ not happening when you follow those steps.