Setup Get a Google API key following the Youtube Data API guide Don't forget to enable Youtube Data API v3 on Google's Enabled APIs page Testing Log in as an admin and go to Site administration > Plugins > Blocks > Manage blocks. Enable the YouTube block In the YouTube block settings, add an API key and save changes. Go to the site home and turn editing on. Add a Tags block to the page via the 'Add a block' link. Click on any tag in the Tags block. (If there are no tags available, add a tag to an item on the site or add a tag to the default collection via 'Manage tags' in the Site administration.) On the tag page, add the YouTube block via the 'Add a block' link. (Note that the YouTube blocks may only be added to a tag page.) Check that the YouTube block displays videos related to the tag.