How can I get NPC's to talk?

I have no idea how to make a NPC either I have been searching for the script but I can never find it neither can I figure out how to make them speak

All you need to do is make a model that looks like a person, insert "Humanoid" in the head, and insert Dialog into the head.

http://wiki.roblox.com/index.php?title=Dialog

make a character name bodyparts things and head Head put a dialog in there and place a dialog choise in theredsfjidsfidhs;fklsnd