I was just wondering if there was anyway to access the cs50finance webpage from outside the appliance, using a browser for example. I was hoping to get some friends who don't live in the same city, (or same country for that matter) to check it out.
have you tried Pset 6? In Pset6 we make a C program to host local contents in computer to be accessible from global Internet. For example your IP is 127.0.0.1 and pset6 set public access at port 8080, then anyone can visit your local contents via 127.0.0.1:8080/index.php for instance.
If you have completed pset 6, you should try merging this with pset7. Otherwise just upload all your content to a free host website, which will take more time if you're not familiar with building websites.