Ok ever since the iPad 1 came out posting to the forums has not been very easy. This seems to have changes with iOS 5.
Steve - Philana is saying that things work ok now. Previously we had to click on the "HTML" button in the tool bar. Out of curiosity... are you saying that you changed some preferences on the website that previously (before iOS 5) allowed you to post comments more easily?
Steve - Wow. I am sure many mobile app users would have liked to have known that tip! In case anyone else wants to see what steve was talking about, here is a screen shot: