So, I'm using a R15 NPC, and what I want it to do is to look at the player at a certain distance?

I'm creating a fan-game and I'm using a r15 NPC and all I want is for it's Head to follow or look at the player at a certain distance, there is something from the toolbox to help me with but it just looks at a brick, I've tried to edit the script and stuff like that, but no use.