The drain is on the lower right side of the radiator behind a part of the frame. It's plastic with a screw head on it so be nice to it. There are little keepers on it that prevent it from coming out all the way. It may be easier to remove the lower radiator hose to drain it.
I've been running the orange Dex-cool since my water pump cratered over 6 years ago. Make sure you flush out all the old coolant.
