How to add images?

If you are not registered with one of sites that allow to upload images (like http://www.flickr.com , http://www.photobucket.com , http://www.webshots.com , http://www.tinypic.com , http://www.pikipimp.com ) and don't wish to bother yourself with registrations, you can use sites like http://www.imajr.com or http://www.imagehost.org .
Here is an example of a hotlink provided by imagehost.org.

To attach this image to a message to a friend, copy image url into 'Attachment' field (by using Ctrl + V or Shift + Insert keys) , select 'Image' as an attachment type and click 'Send to ...' button as shown below.

You can see then, that new thumbnail of your friend will be shown in the 'Outbox' row with the title of the message.

By clicking this thumbnail you and your friends will see your message and attachment in the right panel.

You can also use images stored in your Orkut or Hi5 albums.
Here are screenshots for Orkut after right click on am image and selecting 'Properties' with Internet Explorer.