This is how you do it:
1. Go down the bottom of the post and click the "Manage Attachments" button.
2. If you have the files on your computer, use the "Upload File from your computer" section to upload the files.
3. If you are pointing to photobucket, use the "Upload File from a URL" section to upload from photobucket.
4. Once that is done, you can insert them using the paperclip icon. That will give you this:
