Hello Roj,
This feature is not available on the free version of theme. In our Pro version, you can Show/Hide author name on post and widgets. Besides this you can show/hide comments, date, category and can set the different color for different category too. You can find the difference here. http://www.acmethemes.com/themes/supermag/
All the field and options are changeable on pro version of theme, so we recommend you to use pro theme, although you can customize SuperMag theme as your need based on Child Theme approach if you are familiar with WordPress codes.
If you have any query regarding our theme, please write us.
Best Regards,
Acme Supports