You don't give much info to work with....so
1. Enter the port you want to use in HFS.
2. Enter the static LAN IP address you want to use in your computers operating system
(usually something like 192.168.1.XX, depending on the router) Google for how to, for your OS.
3. Port forward in the router, the port you entered in HFS to the LAN IP you entered in your computer.
4. Turn OFF your firewall, for now. (you can solve problems there later)
You can use
http://network-tools.com/ to find your WAN address and
check to see if the port is open at
http://canyouseeme.org/Last time I checked, HFS self test wasn't working.
Your LAN address should be something like
http://192.168.1.XX:port/
WAN
http://xx.xx.xx.xx:port/
You can connect to your LAN address from your computer, but most routers won't connect to the WAN. (its own address)
WAN testing could be done by someone else, or from work, school, etc.