All of the folders that you have added to the Documents To Go Desktop application will be listed in main application window. A header above the list shows the folder name, the directory path that this folder exists within and the size of the all of the items that are set for synchronization within the folder.
Please note that if a large number of files are set to sync, you will be presented with a warning. It is not recommended that you set your entire My Documents folder to sync, for example.