Don't! Not yet!
To post a picture, use the "attachment tool", blue, at the bottom of the composer box. Once loaded and processed, an option to insert into text full size appears. If you don't check it, or forget, you must go to the picture now at the bottom of the composer, choose insert photo, and choose a size; small,med, large. Not choosing a size at all, the photo appears at the posts end as a thumbnail pic.
From what you describe, it sounds like it might riveted on. That would be unusual and possibly shouldn't be messed with because hard core collectors love one-offs, even if it's dead. And anything odd "should" be documented if you can.
