Here is a video for your reference:
Step 1. Use a wrench to loosen the three screws on the dome cover, then take the dome cover off.
Step 2. Adjust the lens manually to the appropriate position according to your installation requirement.
Step 3. Put the dome cover back and screw the knobs tightly.
Done! You can install the camera in the position you want now. You can click to learn more about installation.