Colliders not working

When I drag the First Person Controller into my scene and press play to try to walk around, the FPC simply goes through the terrain and I can not walk with the controller. I know it’s something to do with “collision”. I’ve attached what I’ve did from a tutorial but it’s STILL NOT working. I can not for the life of me find the best answer to fix this problem.

6160-attachment.jpg

Just add a terrain collider component.