# To show currently configured Interfaces
show ip interface

# To show Current Port Forwards on Router
show ip nat translations

# To Enter Configuation Mode
configure

# To add Port Forwarding rules
ip nat inside source static (TCPorUDP) (YourCompsIP) (PortToForward) interface (Ext.InterfaceName) (PortToForward)

# Example: forward port 3389 TCP to the computer with ip 192.168.1.11
ip nat inside source static tcp 192.168.1.11 3389 interface Dialer0 3389

# End Configure Session
Press CTRL-Z

# Once you have entered the config, test it out and if it works,
# issue this command to make it persistent:
copy run start

# When it says
# Destination filename [startup-config]?
# just press enter.

Thanks goes out to
Aaron Saunders
Senior Software Developer
for writing this guide!