In this persons hand is a HDMI cable, let's say it's connected to the HDMI port on back of your DVD player. On the lower left of this unit are horizontal slots that fit that plug, and written next to them is HDMI. They're probably listed as HDMI 1 and 2. Plug it into one of those, you might have one already in use with a plug from Xfinity, or Directv or a Firestick. That's why you have more than one, you have more than one source.
On the TV when you turn it on, go the menu and select the source for HDMI port you plugged into.
The best cable for connecting, even better than HDMI, is optical cable. There is a jack in the upper left of his TV. It's just a single wire with a squarish head. That is the best option if you have one, if you don't, just stay with HDMI.
