Out of 100.000+ users, I'm the only one, who can't add images to my own original post. I can't "contribute" to my own thread, and I can't edit past the first 48 hours. A bit odd, isn't it? 
I can't either, man. Just tried on a few of my old threads. No Contribute button and my Edit button also disappears after 48 hours so it isn't just you.