Ok, so you got the IP address and port?
When it says upload file, what it means is your Arduino code. If you go further into the thread they are talking about adding reefangel.portal("username"); (syntax I'm sure, forget it caps or not) and dns. You will also need to forward your ports on your router.
When you go to reefangels site, you see portal? Once you have everything set up going to the portal will take you to your setup.
Edit: I apologize that I can't post my Arduino code. I recently re-imaged my PC and I do not have my current code base. But I'm pretty sure in that thread they show it. Lnevo and Rimi are both really good at helping. You could also send Rimi a direct message if what I'm saying doesn't make sense.
Edit 2:
Make sure you have in the headers:
#include < RA_Wifi.h >
And where it says // this should always be the last line have something like:
// This should always be the last line
ReefAngel.Portal( "portal_name" );
ReefAngel.DDNS( "portal_name"-dns.myreefangel.com" ); // not sure if this is necessary
ReefAngel.ShowInterface();