Step: 1. Put on the balance bar and tighten the screws so that the laptop tray will lean on the back seat and will get support force from the backseat. 2. Get the hooks ready, we offer 2 hooks in the package to choose from, normally we select the longer pair, install the hooks on steering wheel or the metal rod and tighten the screws when the position was fixed. 3. Slide up and down the desk tray along the metal and plastic rails according to your target view angle, when the tray position was selected, make sure you tighten all the screws to make tray stay firmly. 4. Use the bungee reinforcement strap as a second enhance regarding the stability. You can also gently press the table surface with your hands to test if it was fixed well or not. How to adjust the table? 1. The rotation button on the anti-skid rod can adjust the height of the tray. 2. The rotation button at the bottom of the tray can be used to adjust the balance of the tray. 3. The height adjustment telescopic plate on the back of the tray has 2 positions. The board is adjusted to the 2nd position. Using tips 1. Please install and remove it by adults. 2. Do not turn the steering wheel while using it. 3. Do not place items above their weight. 4. Do not press the table hard with your hands and feet. 5. Not while driving. The driver can only use it while parked, do not use it while driving. It would be unsafe and probably illegal.