One of the nice post i have ever seen on the search refinement panel display template is
http://blogs.msdn.com/b/murads/archive/2013/03/01/using-jquery-and-jqplot-in-your-display-template-to-show-a-piechart-refiner.aspx

Try the mentioned steps, even if you search for more help you will not get more than what has been explained here.

Check below link if you ever get a requirement to have some link action to be performed on every hover panel..

http://www.sharepointnutsandbolts.com/2014/01/extending-SP2013-Office-365-search-hover-panel.html

All the best..