Connected Printer Server to Port 3 on Router, how to find IP Address

[I_Dont_Care]

So we have this new FIOS Router and i'm connecting my print server to port 3 on this new router, I see there is data moving on port 3, how to determine the ip address given to the device by DHCP for port 3? I don't see the MAC listed in the Router ARP Table

[Edg1]

When you log in the router did you go to “My Network”? Ip and mac should be there. Also there is probably network settings on tbe printer’s menu.