From the LiveWhale interface, click the "Pages" tab. (If the Pages tab does not appear, the administrator has not assigned page editing permissions to you.)
If the page you're looking for is in a navigation, click its title to view the page details screen. Otherwise, click the "File Browser" submenu, navigate to the page's directory, and then click the name of the page.
On the page details screen, check the checkbox labeled "Send editors a reminder to update this page". Choose the schedule upon which you wish to be notified to update this page's content from the dropdown (weekly, monthly, yearly). After choosing a schedule option, also choose the date to count from (for example, monthly from this Monday), as well as the users who should be notified. You may either choose "all editors for this page" to have the notification sent to all editors with access, or choose "an e-mail address" to specify a specific e-mail address to send to.
If you wish to add additional scheduled notifications, click "Add another…"
Click "Save these changes".
Note that content notifications will be e-mailed to you if you have opted to receive notifications by e-mail. (See "Receiving e-mail notifications".)
When browsing directories in the file browser, a flag will also appear next to any page with outdated content.