Launch the 'Telegram'
application. It's a circle icon with a blue background and a paper flight. If you can't find it, use the Windows button to bring up the Start menu and type 'Telegram' into the search box.
Right-click the channel you wish to leave and select 'Exit.' On the left side of the app, you can view your friends and channels. When you right-click on it, a context menu will appear.
From the menu, choose the Leave a channel. On your screen, a confirmation window will appear.
Turn off the television. To confirm your action, select LEAVE from the dialogue box.