You definitely need to seek a button on the remote control which allows you (either directly or indirectly) to set the TV's source as 'AV' (or similar). Your TV set is designed to display a signal provided by its internal tuner; if you don't tell it to ignore that tuner, and accept a signal from elsewhere, it won't be able to display the picture and sound from your video camera.
If there's a 'direct acccess' button on the remote control, it's likely to be labelled 'AV', 'AV1', 'Ext', 'Ext1', 'In', 'Line', Line In', 'Aux', or 'Aux1'.
However most modern TVs now use a 'Source' button as a first step. That's likely to be labelled 'Source', 'Src' or, most likely of all, to show an arrow pointing into a rectangle or circle. Pressing that button should bring up an on-screen menu, allowing you to scroll to 'AV' (or something similar, as above) and select that option.
After viewing the output from your camera, you'll need to switch the TV back to its normal status. If you made the change by pressing a single button (such as 'AV') then either pressing it again, or pressing a 'TV' button should get things back to normal. If you used some type of 'Source' button, and then scrolled through a menu, you'll need to repeat the process to find an input labelled 'TV', 'Aerial', 'Antenna', 'RF' or something similar.
Chris