1) Loosen the screws that secure the dome camera to the base using a screwdriver, and separate the dome camera from the base by rotating it clockwise, as shown in below Figure .
2) Disconnect the network cable and remove the dome camera from the base.
3) Install a new dome camera and reinstall the network cable.
4) Align the dome camera with the base and rotate it anticlockwise, as shown in below Figure .
5) Align the screws with the holes and then tighten them.