Mikrotik Router NETMAP Firewall Configuration

This example provides is that we have a single public IP on our Mikrotik. We want to grab anyone on the internet heading to our IP for WWW and redirect them to an internal WWW server.
The first thing we want to do is disable the WWW server on the Mikrotik.
/ip firewall nat
Add chain=dstnat action=netmap to-addresses= to-ports=80
     protocol=tcp src-address= dst-address=     in-interface=WAN dst-port=80