Need help for Touchscreen calibration

I have a RPi2 running on Osmc 0.9.9,
Connected to a Display with touch from elo touch System, model accutouch 3000u.
It works, but only in the upper left area and the pointer is far away from my finger.
is there a way to calibrate it, I found this thread, but I cant find the config file they used to calibrate.

please help me