Below the block where you put your response you will see "Manage Attachments". When you hit that button a screen will appear with blocks that say "Browse". When you hit browse a file upload screen will appear that is on your computer. You want to point that to the directory that has the attachment(s) that you want to add. Your attachments must be formatted 800x600 and 143k or less in size. When you are finished adding attachments hit 'Upload". That will send the attachments to the Squarebirds server. Once that's done your attachments are in your post. You can hit preview to see them before they are posted.