yes i know but how to add it?
Click "Go Advanced" on the post box. Scroll down below the text area and smilies and click on a button that says "Manage Attachments". If it's on your comp. click browse and select the file; if it's an image link, place it in the correct section. Click upload.
Or, if it's not pornographic, you can upload it at an image hosting site. (tinypic, imageshack, etc)