How do I get my TV to behave like a monitor?

I have a MacBook Air 3.2 version. It does not have a thunderbolt display port, just the normal one. I connected the MBA to the computer via the HDMI slot.
I want the TV to act as a monitor for my computer. In particular, I want it to play video files. That is the reason why I am trying to set up the TV as a display. To play movies so that the movie doesn't take up all the real estate on my computer screen and I can do other things and have other things on my computer screen.
I am in Korea and am having trouble doing this. I connected the TV and the MBA with the cable. What is the next step. I went to System Prefs and clicked "Detect Display" and nothing happens. I have the display icon in the menu bar at the top of the screen.
What should I do with the TV? I went into menu and chose connection icon and then HDMI. The screen is blank and says "No signal".

I think what happened was that I picked the wrong HDMI when I opened Menu on the TV. There were HDMI 1 and HDMI 2 and when I picked HDMI 2 it seemed to start working OK.
The funny thing was that when I moved the menu bar back to the computer, I could not open system preferences. I think whatever I opened and didn't close on the TV, doesn't open on the computer, such as the video and System Preferences.
The second time I tried it, I closed System Preferences on the TV and I was able to open System Preferences on the computer.
The switching of the cursor is slow too. I couldn't find the cursor on the computer and it wasn't on the TV screen either. But after a while the cursor appeared on the screen.
I went to Sound in System Preferences and could not find how to do this:
You also need to set your audio out to use the HDMI connection
Also, I now understand what "Arrangement" does. It is partly for the placement of the mouse/trackpad cursor. If the TV screen is to the right of my laptop, I position the TV screen to the right of the computer screen in Arrangement. So if I want to do something on the TV screen, I move the cursor to the right and off the computer screen. It then appears on the TV screen. Apologies if I am stating the obvious, this is a new discovery to me and I am starting to understand how displays work better.

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