To delete a page go into Pages or All Pages.
Hover over the post you want to delete then select Trash as shown in this image.
Note: If you select Trash the post will send the page to the trash.
Note: If you accidentally it Trash, the page can be restored.
To permanently delete the page select Trash.
Hover over the post you want to permanently delete then select Delete Permanently as shown in this image.
To restore hover over the post then select Restore as shown in this image.