Here are some steps you can take to find the channel guide on your Smart TV:

1. Check the remote. Many Smart TV remotes are labeled with Guide or TV Guide, making it extremely easy to access the built-in guide without having to enter any menus or even remember a combination of buttons to push.
2. Check the Quick Menu. Some Smart TVs have an easy-access menu which bypasses many steps. Try to look for a Quick Menu or Home Menu button on the remote.
3. Check the on-screen menus. Not all Smart TVs put the channel guide on the same place of the main menu, but it will typically be somewhere on the first page. You should see it somewhere under the television-specific categories like 'TV' or 'Inputs'.
4. Check the manual. If you can't find the guide after trying all of the above methods, your best bet is to consult your TV's user manual. It should have a section which details how to access the channel guide on your particular make and model.