Please consult the Documentation tab in the App Store, that should clear things up: https://appstore.home.mendix.com/link/app/27/.
What issues do you have?
The documentation is the best place to start.
We use the Microflow Timer on various pages. You just drop the widget onto the page. You get it to run a selected Microflow or Nanoflow either once after a delay, or repeating every X milliseconds.
What are you having trouble with?