The CMOS jumper should be on the bottom of the motherboard, just under the battery. It should look like the picture though I think the DFI Lanparty nf4 actually say "CLEAR CMOS" near it. Put something metal like a screwdriver between the two pins there. My jumper's actually naked so I don't know if that's a just a cover, or a jumper or what but you can probably figure it out with a little tinkering. And/or pop the battery out for a while then put it back in.
PS I was looking at cases like the Praetorian since you said you liked it's looks and I found
a nice one from Lian-Li but it's cheapest from NCIX and out of stock- if you like it, would you mind waiting for it?