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Hopefully my last question on  this.  It says to.

 Formerly known as Push Key. This key is now required for secure connection between your community and our server. Features such as Push Notification, Single Sign-On requires this key to work. To use this key, copy and paste to  'Tapatalk API Key' field (or 'Push Notification Key', depends on your forum system and version) found in your forum AdminCP Tapatalk Settings.

How do I do above?

I am getting this message from tapatalk below.

Warning! API Key has not been filled or incorrectly filled. Tapatalk can continue to work without API Key but Push Notification and Single Sign-On features are disabled. Please copy the API Key provided in the "Basic" section and paste it in your forum AdminCP, Tapatalk Settings.