Store the referrer

Hi there,

WordPress has the wp_get_referer() function you can use:

https://developer.wordpress.org/reference/functions/wp_get_referer/

Thanks, I was aware of this.

The question I had was how can I use it in one of the generatepress pages

The Theme has little to do with it.
You can store the referrer in many ways. For example:

add_action('wp', function(){
    // conditional logic - if referrer is different to current request URL
    // if page ID is 99
    if ( wp_get_referer() && is_page(99) ) {
        global $my_variable;
        $my_variable = wp_get_referer();
    }
});

change the 99 to match the page you want to get the referrer on.
And i the referrer URL is different to the current request then it will store it in the global $my_variable
You can then access that variable from your form.