Currently Javascript is not enabled on the device/browser you are using to view Bettersquash.com. Perhaps it's a conscious decision, in which case you will need to turn it on if you want to use the random article feature.
If you have no idea what I am talking about, then either ask somebody to help you or perform a websearch for "Turning Javascript On/Off".
The "Popular Article" feature is not a site-critical feature, so don't worry if you prefer to leave javascript off. The site will function perfectly well without it. You just lose the mystery of finding something you might never search for.