Sticky Footer Help

I am currently running WordPress 3.4.1, and I am using a customized version of the Bizz theme by WPExplorer. I am trying to keep the footer stuck to the bottom of the page when there is a small amount of content on the page (like this: https://matthewjamestaylor.com/blog/keeping-footers-at-the-bottom-of-the-page). I’ve tried probably a dozen tutorials, and I can’t get any of them to work. Can someone walk me through it?

This is my site: https://hgsupport.x10.mx/support/

Any help would be great, thanks.