1. You need to have a picture on your PC or on some web site that you want to use.
2. When you post a message there is a button called "manage attachments" use that if your pictures are on your PC.
If they are not on your PC and are on another website use the insert image button and type in the URL.. the insert image button is yellow and has a mountain and the sun in it.. right above the box where you enter text for a new message.