To watch a movie offline, go to your Collection page, scroll over the poster image, and click on the download link. You will be prompted to install the Flixster Desktop player. After installing the desktop player, you can go directly to the application to download movies. Sign in at the upper right, then click on "All" in the left sidebar. Any movie that has not been downloaded will have a blue arrow icon on the poster image. Click on the arrow, and the movie will begin to download.
To play a movie, click on "Downloads" in the left sidebar, then on the poster image for the movie. Finally, click on "Watch Now" and enjoy the movie.
To delete a download, click on "Downloads" in the left sidebar, then on the poster image for the movie, then on the Delete button under "Watch Now." There is no need to clear the files from your hard drive, or to empty the trash. The application will permanently delete the files for you.