You need a place to host them online. They can be hosted from your hard drive, but you would need to set up some kind of forwarding and always be connected to the net. People will usually complain that way cause the pics arent instant.
Anyway, after you figure out a place to put them (fototime.com?) then you will press the image link below the box you type in. Enter the address of the pic (http://www.whatever.com/yourpic.jpg for example) into the popup window and hit ok. After that you will be set.
