How do i make a particle emmit a fire in unity 3.x?

i am using the tutorial for the 3d platform game from unity3d.com and i am having some troubles because it is made for unity 2.x (or so i think?) and i cannot get the left jet to emmit fire. i have not started on the right one yet. help would be much appreciated.

http://musegames.com/contest

Enjoy, they have about 10 their... I highly disagree with their choice's, so I'd give each of them a try =).