If in the bottom part of configuration window appear Invalid settings detected message with exclamation icon over the USB plug, it means, you have to install Oracle VM VirtualBox Extension Pack. Otherwise go to the 8 point of list below.
sudo apt-get install gnome-system-tools
If application will not appear in the list it means that Dash did not index it yet. In that case just open command line and run following command: users-admin (the application will prompt for the administrator password and leverage permissions in appropriate moment).
Click OK, to apply changes. From now the adeed device will be available in the virtual machine.