Connections on the back. Two coax labeled in and out. You connect the in to the antenna. You have a choice of outputs, the out coax or the A/V (3 RCA connectors, yellow for video and red and white for audio). You connect one of these to the TV. If you use the coax out you put the TV on channel 3 and tune channels with the box. If you use the A/V you put the TV on A/V input and tune channels with the box. It's really pretty simple, the box comes with diagrams and pictures.
But, again, do you have an antenna or cable? Apartments have cable. Unless you put up your own antenna, or even rabbit ears, the above paragraph is useless. You MUST connect this box to an OTA antenna. It will NOT work with cable.