You can't, what you need to do is set up adb on your computer, connect to the Costar (over ethernet or wifi), and then issue the "adb logcat" command.
See:
http://www.gtvhacker.com/index.php/Step ... lling_Apps
Instead of step #6, type "adb logcat" instead!
Also note: On the GTV, Settings -> Applications -> Development, enable Remote debugging, and insert your local IP in the field below that one.