Hook um_before_form

um_before_form.php

<?php

/**
 * Hook: um_before_form
 *
 * Type: action
 *
 * Description: Fires after opening tag in the form.
 * May be used to display custom content in the form header.
 *
 * @example https://github.com/ultimatemember/ultimatemember/blob/master/templates/login.php#L29
 * @link    https://docs.ultimatemember.com/article/1059-umbeforeform
 *
 * @package um\templates
 * @see     templates/account.php
 * @see     templates/login.php
 * @see     templates/register.php
 * @see     um_profile_content_main()
 * @since   2.0
 * @version 3.0
 *
 * @param array $args Form shortcode arguments.
 */
function my_before_form( $args ) {
	// your code here.
}
add_action( 'um_before_form', 'my_before_form', 10, 1 );