Hi, I need help for the sketch to control six stepper motor with a ps2 joystick.
You'll learn a lot more if you look for it yourself. I Googled "PS2 joystick Arduino" and got 166,000 hits. Surely you can discover what you need there and learn something in the process.
Yeah, I know but I don't understand nothing because I'm a beginner.
All the more reason to start learning. Get yourself a good tutorial and start reading. There are plenty of free ones on line and some are quite good. You could go way out on a limb and buy a book. For some reason, I like Beginning C for Arduino which is geared to the reader with zero programming experience.