When a user signs up to your Onepager they are given an checkbox to give consent to share the inputted data with you as the owner of the Onepager. 

You can view the data at any time for users that gave consent by clicking the Sign Up tab on any Onepager.

You will see the emails address of all the sign ups with a button to View Content or if consent is not given that it will say Private for those users.

Once you click View you will see the report page which will showcase all the grid sections with the data provided by the user. You can also view the page to see the same thing as you would by viewing the Share link.