This game uses flash so if nothing is showing below you need to enable flash for this site.
Easiest option is to use Edge browser (the one that comes with Windows 10) as it gives the option to allow flash for one session.
If you want to use Chrome then you need to click on the padlock to the left of the site address and select site settings. you need to allow flash and allow insecure content for this site only. (N.B Flash was commonly used for bad practices which is why its been fazed out in newer browsers.
If you are using an iPad, i am sorry you are out of luck :)