Nuts. You'll have to set up one as an Access Point, then, and the other as an Access Point Client. Sorry to lead you in the wrong direction.

As far as IP addresses go, you never want to assign the same IP address to more than one device, so two different ones.

Edit: Oh, and I just downloaded the manual to see if I could help out more. That may be the most worthless manual I've ever seen. Where did you get the information you posted at the top?