from what I could dig up, the firmware and configuration for the older 7550 and the D2200D are supposed to be the same, or at least very similar.
For the 7550, these were the instructions:
Open your web browser and log into the router. The default address is 192.168.254.254. The default user ID is admin and the default password is either admin or password. Once you have logged into the route click on My Connected Home > Network Connections > Broadband (DSL) > PPPoE (edit)>VC1 Configuration click on the down arrow where Protocol is listed and select Bridge, click Apply. You have now placed the router in bridge mode.
Netgear D2200d Modem Manual Guide
Free virtual drive windows 7. The NETGEAR D2200D is a single WAN 802.11n ADSL gateway platform that offers operators a highly cost-effective solution with the NETGEAR quality, reliability, ease-of-use and best-in-class performance they expect. The D2200D. NETGEARallows end-users to experience fast N300 speeds, consistent and reliable connections.