Sorry for the dumb question but I cannot find how to do this?
there's also a great aftermarket app called aTAKEphONE that will take your favorites (starred contacts) and assigns a long-press number shortcut to them, so you long press on the number assigned and you get quick dial
it's still in it's infant stages. I've used this on all my Treos and Centros and worked well. Try it out. It does cost some $$.