How to change Username and Nick name different when register

I really love your plugin.. but i have an issue about another plugin ( User Front End Pro ).

When Edit Profile they said username and nickname must be different.

so how can do that ?

I think something will change in here.. but i don’t know

$wp_userdata['user_nicename']= $username ;
	$wp_userdata['user_login']   = $username ;
    $jfb_log .= "WP: Name successfully converted to $username.\n";
    return $wp_userdata;

Please help me !

https://wordpress.org/plugins/wp-fb-autoconnect/