Existing Buttons Not Clickable?

Hello WP Forum,

I have recently taken over a site for a small local company and I am in the process of updating/ adding content to bring it up to speed. My coding abilities are beginner at best (Im in Marketing, not a coder) and to date I’ve been able to find a thread or YT video to help me out with issues to date, but this one has me a bit stumped. So heres the issue.

if you visit the site here you will see that I have an inactive button in the header “Request a Service” now I can find it if I use Firebug and see exactly where it is, div.requestService – however I can’t seem to locate (and add a link) within the stylesheet.css or Header.php. All I want to do is link it to this page to make it functional and make for a better user experience.

This was setup on TwentyEleven and I am using the latest version 3.8.

Apologies if this has already been addressed on another thread but most if the ones I found were about making the entire header image clickable or adding a Twitter button etc.

Thank you very much.