1,Please put LCD or touch screen on the bottom ,press the power on button , the device will Suction steady and do alignment

2,Put OCA or polarizer at the head of the roller

3,Put a Polarized under OCA or Polarizer to do alignment

4,Adjust the Accurate ruler on the back to align back and front of OCA or polarizer , adjust the accurate ruler on the side to align left and right of OCA or polarier 

5,Use youe left hand to hold the handle ,use your right hand to roll the bottom part will be okay   http://www.phonerepairdevice.com/