mursal: Just to be awkward, Rachel can we upload a "one off picture" directly from the hard drive?
Yes you can. See number 2 in Isabel's post at the top:
"The quickest way to upload an image and include it in your post is to
click on the "Options" tab in the edit window (you're normally in the "Compose" tab) and click on "Add/Update"
under "File Attachment"
Doing it this way doesn't give you as much flexibility to organise text around the photos, because you can't see the image in the post before you actually post it up. But it is a quick way of chucking a photo into a post straight from your desktop/folder...