Apps make [mytinywebdb].appspot.com private if people view that URL

[luvit]

Hi.
I'm out of my league on this question.
I have managed to successfully get a TinyWebDB running with appspot.com.
However, anyone can view the content of the URL, and i would like it to be private, like done at appinvtinywebdb.appspot.com
Is it possible for me to make the URL contents private, but still have full functionality for my app on Google Play?

I'm failing to find these details on how to make that happen
--Thanks, so much.