Change sender name

HI, I’m trying to change the sender name (display “name” and not “WordPress”).
I log to my ftp and inside the plugin there is some files, if I put this code on main.php it could work? Which is the right file to add the code?

This is the code:
// Function to change email address

function wpb_sender_email( $original_email_address ) {
return ‘nameexaple@example.com’;
}

// Function to change sender name
function wpb_sender_name( $original_email_from ) {
return ‘NameExample’;
}

// Hooking up our functions to WordPress filters
add_filter( ‘wp_mail_from’, ‘wpb_sender_email’ );
add_filter( ‘wp_mail_from_name’, ‘wpb_sender_name’ );