i think you need to set the access point to "Ad-hoc" link up. you need to configure the access point, than the dbox. once the access point works than the dbox should be ok.
Adhoc is for computer to computer networks. If youre using a router then you want infrastructure.
You should be able to use it. Make sure your routers security is turned down whilst you get it going and then turn it on slowly. i.e. MAC address control and WEP etc.
Also make sure your routers is set to broadcase SSID . Finally program the access point using a network cable at first, make sure you`ve set all the wireless stuff up just right before you let it connect via wireless.