I don't know that flash, but there are usually 2 ways.
if it uses ettl, you can use the Canon off camera shoe cord 2, which preserves ettl and connects to the hot shoe of the camera and teh hot shoe of the flash.
if not, then it gets more complicated, and you need more parts. you would need a Nikon as-15, a hot shoe to pc adapter, a sync cord (pc to pc), and a hot shoe to pc adapter for the flash.
this will only work in M mode for the flash, and requires a bit of working knowledge of how flash works.
or spend some bucks for pocketwizards 