From the list of applications push the Add application button

Add application button

You need to fill some name. You can change the icon, color...

In Advanced mode, you can change the time zone, default time and number format.

Landing page, description and screen shots are used in case of publishing to the Marketplace.

And that's it. You have an application. When you click on it and open it, it is empty. There are no schemas. Of course ☺