When i try to connect to a computer i see this message:

for connection to the remote computer requires that authentication is enabled

Please Help Me.

Thanks 

Is it possible to provide more detailed info? At least describe how you connect, what did you configured or provide the application log files. I am not able to identify from your description, what is the reason. If your connection requests NLA, there are some issues in the application, which we have to fix. Or the NLA isnt enabled in your favorite connection properties on RDP property pages.
Also have a look at the online documentation (http://terminals.codeplex.com/wikipage?title=Manage%20connections&referringTitle=User%20documentation) for more informations how to configure connection favorite.