To delete a page in a note, navigate to the page you wish to delete, long press on the current page number, then choose Delete page from the page actions menu.
To delete multiple pages in a note at once, tap on the current page number to view all the pages in a note, then long press on a page to select it, then tap any other pages you wish to delete, then tap the Delete (trashcan) icon.
To delete a page in a note, tap on the page number to access the page management screen. Then tap Select (next to the Add button), and tap the thumbnails of the pages you wish to delete. Once selected, tap Delete (trashcan icon).