Is that a box I sent you long ago? IIRC, it was fairly easy to set up once you got the numbers set correctly.
Note that it's not a router, but a range extender or an Ethernet to WiFi bridge. Your router or wifi access point needs to be able to see it first, I think.
Maybe check the comments here (scroll down) - perhaps it'll help a little.
http://www.expansys.de/ft.aspx?k=7579
Good luck!
Cheers,
Scott.