This question already has an answer here:
Just made the switch from zorin to Ubuntu 13.04 and was looking for a dark theme to install and came across this page
I followed the instructions to install the Trevilla-Icons and Trevilla-Jmhzone-Dark Theme
but i cant select them on the appearance settings under themes it doesnt show up, Am I going about selecting the theme all wrong? I've never installed themes before so I'm a bit lost.