Match.com keeps popping up over my Huffington Post news.
There's no close button. There is an option. I clicked it.
It was an option to opt out. It didn't work. Maybe because
I'm so terribly technically challenged. How can I get rid of
This annoying ad.

You need to run a malware/spyware cleaner.
Personal preference is for: Malwarebytes : Free anti-malware, anti-virus and spyware removal download (http://www.malwarebytes.org/)

Free and easy to use.