[April 2019, Launch offer is still active]
Everyone else can access members area at the link above for free and purchase access at Step 0.
You will then have access in the members area to the instructions for activation. It involves giving access approval to Zontracker for your Amazon and Facebook accounts (only if you didn't do this already for other Zontracker features), and choosing which pixel option you would like. No other action is necessary. Zontracker activates the settings within 0-5 days (as of April 2019, the feature was just launched and queue tends to be on the longer end).
After that, you will see the new FB pixel in your account (or merged pixel) when you are creating ads.