Can anyone help me change the keys to WASD?

If anyone's smart enough to know how to change the arrow keys to WASD that would be great. I just need some help I tried using autohotkey but it doesn't work. Did I do something wrong with the code I put this in If WinActive("ahk_exe Undertale.exe") { w::Up s::Down a::Left d::Right I just want to play the game :(