From Beachapedia

This is the "Factoid" form. To create a page with this form, enter the page name below; if a page with that name already exists, you will be sent to a form to edit that page.

Factoids are named in the format -- Beachapedia:Factoid/YYYY/MM/DD
The box should already be filled out to create a factoid for today, so all you have to do is hit the button. To create a factoid for a future date or edit a factoid that has already been created, modify the date section of the page title in the box.