You require a HDMI or VGA cable to connect a computer to the TV.
Most HDMI cables/ports support both audio and video (recommended)
VGA only support video and you will require and additional cable for audio
Locate the correct port on the TV, back or side panel, and with the TV turned off, connect your cable/s
Locate the identical port/s on your computer, and with the computer turned off, connect the other end of the cable/s
Once everything is connected power on the TV first, then the computer
Typically the TV has several inputs to select from, if the TV screen is not showing what is on the computer screen, you the remote to select a different input until the computer screen is displayed on the TV
You may have to adjust the resolution of the computer to provide the best picture for the TV. 1280 x 1024 is usually the best setting.