Some of the Asus boards just had solder pads where the jumpers should be, most are normal though. My older K8N-E had just the pads, pretty sure this newer AN8 SLI deluxe one has the jumper.
the Asus site should also have the Manuals for download so you can figure it out or try one of the Asus/computer forums and ask in them as well.
Pulling the battery should do it as well after a minute or so to let everything bleed down. Usually if you reset the jumper you don’t have to remove the battery