How do you change the background on the new YouTube channel?
When you go onto your channel you should see a bar at the top of your channel (only visable once you have logged in and only visible to you). The bar is just below the standard YouTube bar with: ‘Home Subscriptions Videos Channels’ Click on the ‘Themes & Colours’ tab and the theme’s panel should appear. This is where you can chose from default themes and add your own. Once you have selected the theme you want, then go to ‘Show advanced options’ next to the name of the theme. This should open an extra section and in that section you should see a ‘Background Image’ option. Simple select the image, upload it and click ‘Save Changes’.