Open the app. Some networks should load and show up.
Dragging and dropping networks is done by clicking one network in the list (inside the app) and dropping it above or below another network. You will see a grey line appear where the network will be dropped.
Tested just now on Win10 Home x64, build 1511.
You cannot drag and drop anything from outside the app, or from the app to another application.

I updated the readme as well to make this more clear, as the documentation was unclear.

Thanks!
Anyhow, no network shows when I open the aplication, that was my reason of how to drop networks...
Will continue trying...