Neil,
Follow the instructions (literally) in the area called attachments I forgot the brackets [ ] and instead of filename replace it with the picture you've just uploaded.
[font=Verdana,Arial,Helvetica] Attachment: Inline
Upload attachments (5 or less, 100 KB max) individually before submitting your post.
Select Inline to include pics in your post. Otherwise attachments will appear as links.
Place Inline images in post with markup syntax, e.g. [inline filename.jpg]. [/font]