192.168.##.## is a local non-public ip address and can be only accessed on the local network. You will need to setup port forwarding on your office router and open the ports on your firewall.
There are a few ports you will need to forward to ip address 192.168.1.11. You then go to a website such as www.ipchicken.com to get your public ip address that you will use on an outside network to access your server. Just replace the public ip address with the non-public ip address in your url.
You can try to use a public DNS domain with some services like noip.com.
Set the port forward parameters on your router to go to your server.
Then you add the address to the favorites on FM to connect to it.