trent wroteWhat exactly isn't working?
You don't need to bridge the pppoe connection. You can disable wireless on the modem, and then connect the new router through the WAN port to the modem. And that's it.
IMPORTANT: make sure that you are using 2 different subnets on the modem and on the router, so that traffic can get routed correctly.
For example my modem's Lan IP is 192.168.0.1, it automatically assigns (DHCP) an IP to the WAN side of my router in the same subnet 192.168.0.xxx. And the Lan side IP on my router is set to 192.168.5.1 and it assigns (DHCP) client IPs in the 192.168.5.xxx subnet.
For both, modem and router, the subnet mask is 255.255.255.0
I was told it wasnt this easy since DHCP couldnt be active on both devices, also port forwarding, double nat etc would make it hard to set up the network reliably. I'm no professional so I might be very wrong, will be home in 2 hours and try the simple plug in method you told me to use.