Yup only works from 60km/h and up, or something like that.
You press the I/O button, this turns it on, then you press and hold down the plus (+) button till you can feel the car pulling by itself, then use the plus (+) and minus (-) controls to control the speed up and down to the desired value.
With it on you can press the accelerator to increase speed, if you let go it will go back to the speed you set it to. Pressing the clutch of the brake deactivates it. You can then press the button with the pic of a gauge and an arrow on it (looks like the light in the cluster) to have the car go to the last speed you set it to. Also after you have turned the system on you can use this button by holding it down to set the cruise control the the current speed you are driving at (I think)