Getting AI to walk around the environment.

I have some NPC’s that I’m trying to get to walk around the environment. Not do anything currently, expect when I got up to them, press a button, a string of text will appear. But I’ll leave that for later.
I’ve been looking around, but I can’t understand the documentation and there are no videos I’ve seen on just the simple stuff: way point to waypoint and repeat. Does anybody know of any noobie tutorials for this?

Try this one: