If you want to remove pricing name in traveller form and mini cart section in checkout page, please add following given code in functions.php file of your child theme.

 function hide_pricing(){
    return false;
 }
 
 add_filter('wp_travel_show_pricing_label_on_name', 'hide_pricing');

Before:

After:

Also, regarding creating child theme, please refer link.

If you have any queries, please submit it to our Contact page.