So I did this challenge a bit different then anyone else.
so in the url you would get an ip.com/viewmessage.php?id=questionableid and ip.com/editnote.php?id=questionableid but if you put the same id from viewmessage.php into the id for editpost.php?id=questionableid you would go back a message. So by swapping the ids between the two webpages I was able to go back all the way to the first post which was the key.
I dont have pics but I assure you this was how I solved the challenge.
Peace and love Shiina