When your phone is connected to your home network it should be able to access the dashboard just by entering <PC's IP>:1880/dashboard in the browser URL bar.
It's best to avoid setting up access from outside your network unless you really need to. There are many computers out there continuously trying to gain access to private networks.
A common response when people are advised about this is "I'm not NASA, I have nothing to interest hackers" but the truth is that even if they can't find your credit card details on your PC they can use it to join in cyber attacks around the world.
If you need access though, @BartButenaers has assembled a handy guide on how to do it.
