You can start by adding your Cordova project folder to the app. After that, you can add plugins and platforms, such as Android and iOS, and test your projects on appropriate emulators. You are also able to edit your projects, by setting a path to your favorite editor, build APKs for distribution and more.
It is also worth mentioning, that you can manage plugins offline, and work on your projects locally. Otherwise, The Cordovizer is still in the early stages of development, so you may encounter bugs, while using it.