Little talking bubbles?

In the first map in the human campaign you run into a couple who have lost there book. If you wish to talk to them a little talking bubble apears above their head and you are to click on it, or you can just ignore them. Can you please tell me how to do this in World edit.

I dont really know if you mean the bubble appears after you click it or when the Map Initilizes but this is how you do it.

Events:
Map Initilization

Conditions:

Actions:
Special Effect - Create a Special Effect attached to (UNIT) (PLACE ON BODY) using (BLAHBLAHBLAH)

Then if you wanted to change t to when you click on the unit. Use Specific Unit Event under Events. I don't have World Edit open right now but hope it helps.