The real channel for your example is
The channel ID is :
The model for RSS feed is
So, here the feed is
If the channel ID has been renamed in the main URL... just look at the source code of the channel and search for
channelId. You'll find the channel ID just on the right.
Given that you've subscribed to the channel, an alternative method for finding the RSS feed is to export your subscriptions from your Manage Subscriptions page. Clicking on the Export Subscriptions button at the bottom of the page will allow you to download an XML file that has the channel names and RSS feeds for all subscribed channels.