First create a YouTube page and make sure you choose the name of the template from the Page Attribute section then clicking the publish button to save updates.
To add a YouTube feed in the hotsites, go to the dashboard and click on settings under Social Mobi Hotsites.
On the settings page scroll down to the Social Feed Settings. Enter YouTube username in the space provided for then click the Save Settings button for Social Feed Settings section. Once successfully saved a note "Updated" appears.
This is how your youtube feed looks like when a someone clicks on the YouTube Feed tab from your homepage.