Problems with visual composer i want to be refound

The item was intall but he don t want to work…so i wan t to be refond by Evanto.
How i get the support guy’s to resolve my problem to be refound.The problem it s in pictures!

problem to be refound.The problem it s in pictures!

Contact the plug-in author before requesting refund

please tell me how beacause i don t no!!! i am a normal guy…i am not a IT pogramer.where i find the email of him.thank s

Support info here https://codecanyon.net/item/visual-composer-page-builder-for-wordpress/242431/support