If you want to send a picture from your profile album, go to the picture, right click on it, select Properties, highlight the entire url of the picture's file name (for example from the "http" to the ".jpg" part of the file name), press Ctrl-C to copy the information, start a message to your friend, then in the body of the message:
type: <img src="
press Ctrl-V to paste the picture url you copied above
type: ">
It should look something like:
Code:<img src="http://blahblahpicture.jpg">