There is no way to attach pictures to a PM. If you are posting to a group, then either hit the "Go Advanced" button, or the "Quote" from a previous posting. Below the text window that you type in, there is a button labelled "Manage Attachments". Pressing this button will open yet another window. There is room for four attachments. Press the browse button beside the spot you want to use to insert pictures. Navigate to where the picture is on your computer, then hit the "Upload" button.