I am not sure exactly how I can proceed in making a website retina device compatible without being able to test and see if it is working. I have followed the guide here http://www.presscoders.com/2012/10/how-to-make-your-wordpress-theme-retina-ready/ for installing and setting up the plugin wp-retina-2x and it seems like it should be working, but I have no way to tell if it actually is.
This is what i'm working with http://brainbuzzmedia.com/themes/expression/
If anyone has a retina device, are any of the smaller images showing up in retina resolution? Their filename would have "@2x" at the end of it if they were.