i think you just install it using the PClink install option, it'll appear in the freeloader list (and is the only thing ive got on my freeloader)
using it is simple, works exactly like a file manager, you can copy and move stuff between folders and such by pressing select on a file/folder for the menu
In the pic viewer, press Select to toggle between full size/resized to screen of the images... pressing START will allow you to save whatever is on the screen at that time as your desktop image. Pressing A changes the scroll speed (for fullsize mode)
when you click an MP3 it plays it automatically, pressing left and right on the controller will move through the equalizer settings
Hope this helps
Bonks