Almost Free day - HELP

I am a new user to this website, a new user to purchasing for my 11 yr old, and a new person to these forums. I am getting a kit for my kid’s birthday (https://www.sparkfun.com/products/12060) and looky looky I happen to be purchasing on a day that there is some big ‘sale’ going on. “Almost Free” is about to commence but I don’t understand what I am supposed to do.

I originally thought I would be picking what boards or products I wanted for a penny, but that isnt the case? I have to dive in amongst a bunch of other people at 10 am and put a sku “Almost Free” in someplace in order to hopefully get a grab bag of stuff? How does this work? Where do I put the sku in?

https://www.sparkfun.com/news/2145