From that menu you can fully configure your file server trought a grafical interface.
At this point you've made your first basic configuration. If you want to test it, please tell a user witch is in the channel you've chosen to share to use the command:
E.g: If your nick is "Mickymouse" and the trigger you've created is called "!mp3", on channel #kvirc, please tell a #kvirc user to use: