To remove the authoring information you can simply edit the content type as follows:

  1. Go to Administration > Structure > Content Types > edit > Display settings
  2. Uncheck “Display author and date information”
  3. Save Content type

Another way is to edit your theme directly. If you need to remove the author and leave the date or vice versa, editing the theme would be the easiest solution. If you are not comfortable with editing the theme, then find a module that does it for you and list it in the comments below.

By master