You can add pictures anywhere you want, other than profiles, but with the exception of your avatar, you will have to link them in via internet photo web sites like
photo bucket, or upload them as attachments.
To upload as attachments, use the advanced setting, go to additional options, and click "Manage Attachments". A popup window will open, and you can upload the pics you choose from your 'puter. Keep in mind though, that the total of the files in one post has to be less than 39.1KB, so you will have to down size your pics to the appropriate size before attaching them.