Change/Add a field name

OK I have made some progress.
I figured out I need to edit the file named functions.php
And I should probably create a child theme which I have done.
I know my functions.php is being read from the child theme as without it my style was all messed up, with it the rest of my page looks normal again.

I now have the following code in my child functions.php but nothing has changed in the form. It still says city. Have I picked the wrong function to insert?

<?php

add_action( 'wp_enqueue_scripts', 'enqueue_parent_styles' );

function enqueue_parent_styles() {
   wp_enqueue_style( 'parent-style', get_template_directory_uri().'/style.css' );
}

function my_gwolle_gb_author_origin_label( $label ) {
	// $label is a string
	$label = 'Mobile Number';
	return $label;
}

Silly Me,
I missed a bit from the example. That works. ??

function my_gwolle_gb_author_origin_label( $label ) {
	// $label is a string
	$label = 'test';
	return $label;
}
add_filter( 'gwolle_gb_author_origin_label', 'my_gwolle_gb_author_origin_label', 10, 1 );

Marked as resolved

Hi Pollard,
Glad that you got it sorted ??
Have a good weekend,
Marcel