Adding IR codes

I would like to add the IR codes for a Sonance Navigator Harbor. Do I need an Apple computer to do this? I read the instructions on how to learn the IR codes and have done so with iLearn. I’m a little confused as to how I can get the codes loaded on to my iPhone. I also can’t seem to find the iTunes file sharing directory to locate the .plist file.

Found the .plist files after loading dropbox on my computer but there is no RoomieCodes.plist file

After learning codes or finding codes on the net, they can be inserted into Roomie using the instructions here in the DDK: