[Plugin: WP About Author] Shoe author nickname instead of name

Good plugin, easy to use even if I needed to modify a lot the php file to translate and work with the social links.
My main issue remains the chance to show the nickname instead of the username.
Is it possible?
If yes, can you write down the code to add in the file?
Thanks!

http://wordpress.org/extend/plugins/wp-about-author/