I believe that is disabled on this forum. You can directly upload pictures into your posts (little paper clip icon - on the 'reply to post' form) or many of us upload our pics to photobucket or the like and link to them (mountain icon).
When you start a thread or post to a thread, look down the screen & you will see the "Manage Attachments" button. Click that, select fotos & upload, then submit reply or post!