I havent been able to find a tutorial on evanvato elements fro turning psd designs to android elements

I am new on Android development, I like some of the UI kits on envato elements, but My problem is that I dont know how to turn them from design to elements to be used while developing.
And I havent been able to find a good tutorial on how to do that. Is there any I am missing from the courses and tutorials in envato. ?

thank you