In order to Add/Delete/Duplicate/Rename pages(features) in your app you have to navigate to your Application Dashboard. On top left you can see 4 buttons which will help you to manage your app feature set. 





Add new page of specific type (which you have to choose). 

NOTE: Please make sure that you will need to configure page settings. Also if is not a tab, you will have to link this page in your app.

Remove selected page from the app resources



Duplicate selected page



Rename selected page

NOTE: Please make sure that you update all links to this page in your app.