Hi Laxman,
The selection helper widget would allow you to use a microflow to determine which record to select in your listview on page load. To accomplish what you want to do, your page would need to have a dataview that contained the object that you are using to select a date on the previous page, then your listview and selection helper widget would be inside this dataview. The selection helper widget would use a microflow that would have a parameter of the same type as your dataview and from there you can determine which record to select, and return it in the end event of the microflow.
I saw in your question that you said the widget isnt working, maybe give a little more detail on how you configured it and if there are any error messages.