First head to your profile page. You can do this clicking on your name at the top of the screen (your name will show where it says "Romilda Vane" below).
Once on your profile page, click on the Declarations tab (second along). At the bottom of the page, you can confirm that you've read Keeping Children Safe in Education. There is also a link to the document itself.
Once confirmed, the date of the confirmation is recorded. This date is used for board-wide reports on members' declarations.