but how can i post the pictures without doing that i want the pictures to show on the message box
First, you have to upload the pics to a host site on the Internet. You cannot just post a pic that is on your home computer to a message on here. That's why I mentioned the free Photobucket album in that previous link.
Anyway, as long as you've uploaded the pics to a host site copy the URL of wherever the pic resides and when you create a new message click on the
Image link near the bottom right side of the message window and paste the URL into it.