how to edit and save playlist?

i can't seem to rename my playlist by rightclicking it. a dialogue box pops up and say that it can't be done. and also when i make a playlist using wmp11 and synch it with my m6, that playlist won't appear in my miniplayer when i use and operate it. but that playlist will appear and can be played through wmp11 when i do connect my player to my computer. is that normal?

any help would be much appreciated.

what I do is to copy it to my desktop, rename it, and copy it back to the player

finally worked.=) thanks a lot man.