wpmem_ul_search_args

$defaults = array(
    // HTML wrappers.
    'heading_before'  => '<legend>',
    'heading_after'   => '</legend>',
    'fieldset_before' => '<fieldset>',
    'fieldset_after'  => '</fieldset>',
    'main_div_before' => '<div id="wpmem_ul_search">',
    'main_div_after'  => '</div>',
    'row_before'      => '',
    'row_after'       => '',
    'buttons_before'  => '<div class="button_div">',
    'buttons_after'   => '</div>',
    'results_before'  => '<h2>',
    'results_after'   => '</h2>',
    'link_before'     => '<p>',
    'link_after'      => '</p>',
    // CSS classes & ids.
    'form_id'         => 'wpmem_search_form',
    'form_class'      => 'form',
    'button_id'       => 'wpmem_searchsubmit',
    'button_class'    => 'buttons',
    'results_term'    => 'results-term',

    // Labels.
    'heading'         => __( 'Search Members', 'wp-members-ul' ),
    'search_for'      => __( 'Search for:', 'wp-members-ul' ),
    'search_by'       => __( 'Search by:', 'wp-members-ul' ),
    'button_text'     => __( 'Search', 'wp-members-ul' ),
    'results_heading' => __( 'Search Results For:', 'wp-members-ul' ),
    'results_link'    => __( 'Back To Member Listing', 'wp-members-ul' ),
    'default_search'  => __( 'Choose from list', 'wp-members-ul' ),
    'default_results' => __( 'You did not specify a search field. If you specify a field to search from the "Search by" list, you will get more relevant results.', 'wp-members-ul' ),
    // Other.
    'strip_breaks'    => true,
    'wrap_inputs'     => true,
);

add_filter( 'wpmem_ul_search_args', 'my_search_args' );
function my_search_args( $args ) {
  
  /*
   * Make changes to any defaults.
   * Specify the key and the value
   * as follows:
   */
  $args['heading'] = "My Heading";
  
  // Return the filtered result.
  return $args;
}