check every page no matter how insignificant it might seem (your target is on a very insignificant page
). You are looking for a hidden directory with a file you are interested in
I can't say anything else without a major spoiler. In real life to find stuff like this you'd normally use some spider like burp intruder rather then go through hundreds of pages by hand.
First few steps aren't that hard...but I'm stuck on this one too...a bit later