How to uninstall/remove the program?

CrossFTP client and server is installed as Java cache in your system, hence you do not need to remove it in most cases since it does no harm to your system. If you do want to clear CrossFTP in the cache, following the guides:
You should be able to find the uninstall/remove program item in the control panel's Add/Remove Program list. Click to remove the CrossFTP. For CrossFTP Server, if you checked the "Start Automatically after System Login" on server's main frame, please uncheck it before your uninstall.

Please open the Java Web Start's control pane,  choose to view the Java Web Start cache. In Java 1.6,  this is located at General -> Temporary Internet Files -> View.... After that, select the CrossFTP application item, and choose to remove the application.
Or you can show this Java Web Start control pane by command line:
    javaws -viewer

Attention: For the CrossFTP Server , please make sure you have unchecked the "Start Automatically after System Login" before your unstallation. Otherwise, when you restart the system, the system will popup the warning that states "the machine can't find the program".