I've just purchased elementor, mainly due to the fact ELEMENTOR is advertising “PREDESIGNED & BEAUTIFUL Pro Templates” on its pricing page: https://elementor.com/pro/

Being a totally newbie in both elementor and WordPress, I can't find my way in to use these templates, although I have done my research through keywords (elementor, predesigned, etc….) within the WP themes directory…

I would really appreciate any help

How should ELEMENTOR PREDESIGNED TEMPLATES be installed and used?
I've checked youtube videos as well, but most probably I've missed the right one on this subject…..