oh. no.
you actually only needed one wireless router which will be the 'gateway' to the internet (your roadrunner thing).
the other, should just be a wireless access point. anyway. Is it possible for you to return one d-link in exchange for just a wireless access point?
if not ... you need to figure out how to disable the routing and dhcp function (I don't know how to do this) on the one that is not connected to roadrunner (let's call this the AP, and the other the WBBR). I.e., make it act like a normal switch or regular hub.
Let the WBBR do the routing and the dhpc-ing. Give the AP an IP address that is outside the WBBR DCHP range.
then, you need to ensure that all your devices are :
1. pointing to the WBBR IP add as the gateway
2. having the same SSID
3. on the same WEP key (you do want to have encryption don't you !?!?! use your mobile phone number if you have to !)
4. oh. and same channel.
It might help if you can ask the some experts in
http://www.broadbandreports.com/forums/all
or read the faq there. good luck.
p.s.: and read The_Dude's reply. disable. if you need firewall, configure it on the WBBR.