||During the initial set up of your TV you will have been asked to perform an initial scan of TV channels. If you skipped this you will need to do it to receive the available channels. If you move house you will also need to rescan the channels as you may be serviced by a different transmitter.
If new channels come on air you will normally be prompted to rescan to pick these up. You can rescan at anytime without any problems.
Full details of how to scan for channels can be found in your manual.