You can edit your posts if you realize you have something to add after hitting submit. Click "Threads" and you will be presented with a list of your recent com

You can edit your posts if you realize you have something to add after hitting submit. Click "Threads" and you will be presented with a list of your recent comments. Anything that is still editable will have an "edit" link. I am not sure how long this link is available but its definitely longer than an hour.