Locate the icon for the Promethean Board software. It’s located in the system tray (in the lower right corner of your desktop). Hint: You may need to click on the small triangle in order to see all the running programs. 
Right click the Promethean board icon, select Calibration, then either the 5 or 25 points calibration.
You will need to click on each cross on the board in order to complete the calibration.
