Oh and I just realised that the forum is cutting off the photo because it cannot display all of it as it will make the thread annoying to read because it will have to expand the page horizontally.
To avoid that you can upload the picture as an attachment directly to the forum, by clicking Upload Attachment. It's above the blue highlighted box below [Save][Preview][Submit]
If you upload an attachment it will recognise when a picture is too large and embed it inside it's own frame with scrollbars.