You can do calibration with writing pad as following.

Step 1: Click 【Start】>【Control Panel】>【Penpower Junior writing pad】
Step 2: When prompted by this small window on your screen, touch  the upper left-hand corner of the writing pad as instructed.

　
　
Step 3: Using the Crystal touch and E-cat Penpower Junior Handwriting pads as an example, tap the upper left-hand corner with the pen as shown in the picture below.


　
Step 4: When prompted again by the small window, touch the lower left-hand corner of the writing pad.



Repeat the directions in Step 3 following the picture. Touch the upper left-hand corner of the writing pad with the pen, and so on until all four corners are calibrated. Then click【OK】.