Does anyone know the secret to the flying car trick? also known as the hummer floating card?

I am talking about a website or you can just say it. do you have to buy anything? is there string involved?Does anyone know the secret to the flying car trick? also known as the hummer floating card?OH good luck because I just got mine today and It gave me a link on youtube all you have to do is go to youtube and in the search field you put HARLEYDAVID22.BUT MAKE SURE IT IS NOT CAPITILIZED OH AND BY THE way there is string involved but you can use an alternative like black thread and then you have to strip it down to make it look barely easy to see.