How to hide the page title

For all pages

1. Open the "Customizations" window for the root page (Design -> Customizations)
2. Insert this code:

.page-title { display: none; }

For just one page

1. Open the "Manage head tags" window (click "page options" in the menu bar -> Manage head tags)
2. Insert this code:

<style>
  .page-title { display: none; }
</style>

* Please note that in this case the page title will only disappear in the published page, you will still see it in the editor.