There's a step by step guide on how to get it running on TeamCyclops forums here, but the site seems to be down for me, maybe it'll load for you though  it could be a problem my end.

The slot-2 backup tool is much easier to use and more reliable imo, but obviously you need a slot-2 cart like supercard sd, m3, etc, to use it. All it does is backup your original game card to the sd card in the slot-2 device, then you can transfer it to PC. A lot of new people to the scene don't own one of these though so the Wi-Fi tool is the only way for them to get a backup of a retail game onto their PC in .nds format.

These tools are what the majority of the scene groups use to dump DS ROMs and its not often they get updated.