There are two basic types of content Posts and Pages that you can create in WordPress.  When creating posts or pages WordPress uses that author information.   You can update your Author profile under the Users tab in the menu.

Users can be updated here as well as new users added.   Users profiles can be changed with different color scheme for the WordPress dashboard, keyboard shortcuts and toolbar settings.   Users can also change their author details, including bio info and display name. If you want to add additional users to your website dashboard you can add them here.