This function isn't available when the camera's Wi-Fi feature is enabled. So head to Setup Menu 3 and set the Wi-Fi/NFC option to Disable. (Likewise, you can't use the Wi-Fi features when the camera is connected to a TV or your computer.)
Next, turn the camera off and connect the smaller end of the HDMI cable to the HDMI port found under the cover on the left side of the camera.
At this point, you need to check out your TV manual to locate the HDMI terminal on the TV (or other video playback screen) where you should connect your camera. You also need to consult your manual to find out which channel or input source to select for playback of signals from auxiliary devices.
After you sort out those issues, turn on your camera to send the signal to the TV set. For the most part, you can control playback using the same camera controls as you normally do to view pictures on your camera monitor. But if you're playing movies or a slide show with background music, you must adjust the volume via your TV's audio controls.