Help with set up... What am I doing wrong?

You can check the logs to see what directory it was looking for.

Also check to see what Nginx is responding to in /etc/nginx/sites-available/somename

It says the logs aren't found.

When I go to /etc/nginx/sites-available it shows the two domains I have configured with and without the www so I guess that is ok. Shouldn't I be able to see one of my domains through the Forge IP address?

This is all too foreign to me.

Check that your app/storage is writable.

It says the logs aren't found.

Check /var/log/nginx/* or check inside the sites-enabled files to see what log paths are set.

When I go to /etc/nginx/sites-available it shows the two domains

Good, you should also check sites-enabled

Shouldn't I be able to see one of my domains through the Forge IP address?

Maybe but depends what Nginx is setup to show.

My DNS hadn't propagated fully. It said that it had yet it hadn't so not much help here. @JeffreyWay, is there a way to delete a question?

That's the first thing you check :P

Never delete a question. It always helps others

I had, when I pinged the URL it showed the correct IP address. When I checked using http://propagatedyet.com and http://whatsmydns.net they both showed the correct IP. I flushed my Mac's DNS cache yet still it showed the old webpage.

On that note... Is there anything else I should / could have checked?

You should probably use something better than that https://www.whatsmydns.net

Also, a ping could be different to your browsers cached DNS version.

You can also use something locally to do the same thing as DNS checkers by adding your own to a file: https://twitter.com/bbashy/status/517459575415394304