Finding the RSS Feed of your YouTube Channel To find the RSS Feed of the Channel you want to add, first you need to go to that channel's home page. Once you're there, you need to right-click and View Page source (or just use CMD+U / CTRL+U). Use CMD+F / CTRL+F to look for "RSS" in the page source.

What is an RSS YouTube Feed? An RSS YouTube feed is a way to use the YouTube Channel or playlist ID to aggregate the videos from that channel or playlist into an RSS feed. This RSS feed can then be added to your website using a website plugin or by manually creating the code to add the RSS feed to your website.

Both the URLs open the same page on YouTube and the full URL is always in the format - /channel/<CHANNEL-ID>. The custom URL can be modified by the channel owner but the Channel Id URL will always stay the same.