-register and install either the Alexa Skill or the Google Assistant Skill here(depending on which voice assistant you use).  Once you do that, say “Ask Send Me a Sample for Neon Zebra” and go through the steps to request it.  If you want to use Alexa, you can download the Amazon app here. It should show up in your order history here when you’re done. 
Update– these send me a sample freebies seem to keep going out of stock, but there are some available at the moment.