If you have a YouTube account you can upload your screencast to YouTube by selecting “Publish to YouTube…” from the “File” menu. This first popups the login dialog.
When you have logged in, you get a new dialog where you fill in the necessary information describing your screencast. Note that all fields have to be filled in for the “Publish” button to be activated. Press it to start the export and upload of your screencast. A progress bar will indicate the progress of the export and upload processes. You can press “Cancel” to abort an upload.
You can specify HD quality upload, for higher resolution video.