You need to go to the NXT asset exchange, you can go there either via the Supernet lite wallet

https://www.youtube.com/watch?v=eAh7kFcHTHk

or

easier straight away from the nxt asset exchange

https://nxt.bemining.net

At the moment the Ticket to travel to the future is selling at $1million or the equivalent of 100 million NXT


the name of the ticket in the nxt asset exchange is called timeticket and  Asset Id:  392304033363880873

Below is the picture of a ticket to the future