Hello I am using MAc OS X MacBook. I wanted to download some themes but I was curious if I only could download themes for Mac OS X and not themes for earlier Mac versions. I also am at a lose how to install the themes. Do I need to place them somewhere or once I click on them will the be placed in the appropriate area. How do I change my themes once I have various themes installed. When I googled macbook themes I cam across the word "wordpress" I'm wondering what that is?