Connect it just like you would a TV.
So depending on the projectors inputs, you can use HDMI, Component or composite.
I connected the Sharp AN-C3CP component connection cable in the back of the projector. I had to also purchase a "3-rca rgb rg-59/u component video splitter". I did this because the red,green, blue outlet was already occupied on the cable box.I switched the projector to the appropriate input "input 1". However, the projector received no feed from any cable channels.