Navigate back to the Basic page settings located at /admin/structure/types/manage/page or by using the Admin toolbar and clicking on Manage | Structure | Content types, and select the Edit link from the drop-down button next to Basic page:

Display settings is a single configuration that triggers whether to print the author's username and the date the content was created on our page. In most cases, we would uncheck this option as it would be preferable to create actual fields to store the data that can be presented and styled in a different fashion.