-how to bind keys for 6k
-I have struggle to find packs at this key mode. Can someone give me names of packs for 6k?
Main Menu -> Options -> Select Game -> Dance
Main Menu -> Options -> Key Config
The columns are in this order:
Left, Upleft, Down, Up, Upright, Right
Thank you for helping me dude 
That screenshot Maple linked is from here A List of All Major Simfile Packs For StepMania. Scroll down to Solo (6key) and open the spoiler, to have convenient clickable links for all packs.