Hmmm, weird. I can't help you much, it must think you aren't rooted somehow.
As far as posting a pic, you need to click the postcard looking icon in the reply to thread window. It will give you an option to insert image url. Just paste it in there, and you should be able to post the pic. To make sure it works, click preview post before you submit it. (it took me the longest time to figure that out! lol)