Media : How Can I Re-order Playlist?

I want to change the order of songs of playlists created in my Android [Samsung Galaxy S / Vibrant], but can't figure out how to do it. I've figured out how to create playlists and delete duplicates. I can delete songs from a playlist, but if I just want to move them up, so far no luck. [I'm trying the free version of MixZing player since the std. player says there's not room in my music database to show me the artists in my collection, but that's a different problem. I suppose there's a chance that upgrading MixZing might solve this problem, but I doubt it.