I have a thread http://ubuntuforums.org/showthread.php?t=1205372 in which, although I started the thread and I am logged in, I cannot edit my original post nor any of my posts from 2012 or earlier. I can edit a reply that I posted in 2013. Can someone explain (or point me to a discussion which explains) why I'm not able to edit my own posts? Is it based on the age of the post?

Finally, is there a work around so I can fix/update the information in my original post? Thanks!