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Help video can be found:
1) You have paid, but "Unlocked button" is now showing again.
Try clicking it again, button should disappear immediately.
Check that you are logged in to Windows Store before launching the app.
Do you have the latest Windows Updates installed?
Last thing to try is to uninstall app and then reinstall it.
1) Where to find the gallery on Amazon devices
From the Home screen, select Photos.
Navigate the lists and select Device.
There you can select Zen Coloring book for Adults
2) Is there a way to select previously used color that is not in my palette anymore?
YES! Open the color selection tool, click the blue pipette button. Click anywhere in your artwork to select that color.