As a Page Manager, you can see the page title part of your URL from onMessage.
- Navigate to onMessage.
- Select Website > your site.
- Under Landing Pages, locate your page.
- Click the Grey Wrench icon > View Page.
- The page title part of the url will be after /page, and before ?siteID...
- This is what you'll want to add after your www.school.org/page.