enabling UPnP

Open AirPort Utility - Click Manual Setup

Click the Internet icon

Look for the NAT tab below the row of icons next to the Internet Connection, TCP/IP, and DHCP tabs

IF.....you don't see a NAT tab....your device is likely configured in Bridge Mode. You will have to make the UPnP or NAT-PMP settings on your modem/router, not the AirPort.

You can't as UPnP is not supported with the AirPorts. However, Apple does provide something similar, which they call NAT-PMP. You will find this option on the NAT tab within the utility, listed as "Enable NAT Port Mapping Protocol."

Can u by any chace explain that in further detail? i am trying to find it in utiliaty and i CANNOT. thank you