To select a specific date to find your feedback result you want, please follow these steps:
Go to the top of the page click on 'Reporting' and then on 'Feedback results' or 'Dashboard'.
On the right side and the top of the page you will see a button to open the side bar. The button looks like the image below. Click on this button and the side bar will open.
When the sidebar is opened, choose a specific period and click on 'Apply date'.
Now you've selected a specific period!