The default url for editing posts on these forums is:
http://new.fantasyflightgames.com/edge_foros_editar.asp?efid=
X
&efcid=
Y
&efidt=
Z
&efidm=
XYZ
X - The forum subsection such as "UFS Off Topic" , it's a numerical value. For UFS Off Topic that # is 32
Y - For all areas UFS this number is 5. I'm too lazy to go and find out other sections.
Z - This is the thread #
XYZ - This is the # of the post within the thread that you wish to edit.
To edit this post the link would be:
http://new.fantasyflightgames.com/edge_foros_editar_tema.asp?efid=32&efcid=5&efidt=60652&efidm=60652
For me to go and edit my trade thread, the link would be:
http://new.fantasyflightgames.com/edge_foros_editar_tema.asp?efid=31&efcid=5&efidt=404&efidm=404
Here is the link to my trade thread so you can verify my work:
http://new.fantasyflightgames.com/edge_foros_discusion.asp?efid=31&efcid=5&efidt=404
So for those of you who keep saying "You can't edit your posts", you can. I would recommend on your computer keeping a note pad file with the URL if you find that coming up with the right link for editing your trade thread is challenging.
(Or save it as a favorite/bookmark in your browser)