Hi Anahita,
Again, we will need to see the settings you are using. Please provide them. If you have just set up an account, you should likely be using server.lunarpages.com (replace server with your server's name) rather than your domain's name. I have a text-base description of how you should set up to connect at the following location:
http://www.lunarforums.com/forum/viewtopic.php?t=12311 If this still does not work, please please provide the settings you are using for each field in the Remote site defintion area in Dreamweaver.
Thanks