Board Thread:Support Requests - Getting Technical/@comment-40240789-20200602202553/@comment-9605025-20200602204704

Allow me to rephrase Dralkyrie's comments in case the re-wording helps. You can import FandomizedActivityFeed but it doesn't work the way you think it does. It is not something you insert on the page with a tag. It is CSS that needs to be imported via your wiki's CSS. As far as the page containing the feed is concerned, there is nothing different you need to do.

To import the CSS, go to MediaWiki:Common.css on your wiki and place the @import line that Dralkyrie provided at the top of the page.