Mendix countdown widget

Hi   I have discovered that there is a “countdown widget” in the app store. I have downloaded it and I am having difficulty in understanding how it works.  I would like this countdown widget to count from 20 seconds to 0 seconds each time a button is pressed. ( There will be an informational message that pops up as well to ask user to wait for 20seconds).    Currently my Timer Value Attribute is a stored attribute with a default value of 20. The on Complete microflow is a microflow that sends data to a cloud service. May I have some tips with pictures if possible on how I to do this please? 
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