the magic words are "Port Redirection".
Your Router has to redirect port 80 to your local adress 192.168.1.105
How this can be done can be read in the reference manual of your router.
If you are using an other port than 80 for IWP, of course, your router has to redirect this port, and not 80.
greetings from germany
I had already tried Port Forward the routers application/gaming tab. I tried to forward 80 but it was already being used by my internal security system. I read somewhere that FMP had registered port 596 so I used that port to forward to 192.168.1.105 but that didn't work either unless I'm not understanding what the correct URL is from the router.