1.Put the matal adsorbed every small magnet of the back of Under Table Heating Palte. Attention:metal absorbed with small magnet.The center of metak installation should justify with the magnet.(There are 2 pieces as backup,please keep it.) 2.The place of installation on the back of desk should be cleanded up. 3.Remove the protecting film on the install iron sheets. 4.At last hold the Under-Table Heating Plate,and it is pasted in the clean place then applied with firm pressure.