iPhone / iPod music playlist..

[Hessah]

Anyone know how I edit a playlist on my iPhone? (not sure if the application is similar on the iPod)

When I first edit my On-The-Go playlist after i'm done it saved it as On-The-Go 1..

I added some music and wanna add it to my playlist, but I cant find the edit button...

There's still the On-The-Go option but if I had to it it'll make a new playlist - On-The-Go 2...

now i've got an extra On-The-Go that I don't want..

So how to I edit/delete my existing playlist?