Source: templates/password-change.php

<?php
/**
 * Template for the password change
 *
 * This template can be overridden by copying it to your-theme/ultimate-member/templates/password-change.php
 *
 * Call: function ultimatemember_password()
 *
 * @version 2.8.3
 *
 * @var string $rp_mode 'pw_set' or 'pw_change' for display it differently.
 * @var string $rp_key  Reset password key.
 * @var array  $args    Change password arguments
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
?>

<div class="um <?php echo esc_attr( $this->get_class( 'password' ) ); ?> um-um_password_id">

	<div class="um-form">

		<form method="post" action="">
			<input type="hidden" name="_um_password_change" id="_um_password_change" value="1" />
			<input type="hidden" name="login" value="<?php echo esc_attr( $args['login'] ); ?>" />
			<input type="hidden" name="rp_key" value="<?php echo esc_attr( $rp_key ); ?>" />

			<?php
			/**
			 * Fires at the start of the password change form. Just after hiddens.
			 *
			 * @since 1.3.x
			 * @hook um_change_password_page_hidden_fields
			 *
			 * @param {array} $cp_args Change password form arguments.
			 *
			 * @example <caption>Add hidden field at the start of the change password form.</caption>
			 * function my_custom_change_password_page_hidden_fields( $cp_args ) {
			 *     echo '<input type="hidden" name="my_custom_cp_input" value="1" />'
			 * }
			 * add_action( 'um_change_password_page_hidden_fields', 'my_custom_change_password_page_hidden_fields' );
			 */
			do_action( 'um_change_password_page_hidden_fields', $args );

			$fields = UM()->builtin()->get_specific_fields( 'user_password' );

			UM()->fields()->set_mode = 'password';

			$output = null;
			foreach ( $fields as $key => $data ) {
				$output .= UM()->fields()->edit_field( $key, $data );
			}
			if ( $output ) {
				echo wp_kses( $output, UM()->get_allowed_html( 'templates' ) );
			}
			?>

			<div class="um-col-alt um-col-alt-b">
				<div class="um-center">
					<?php if ( 'pw_set' === $rp_mode ) { ?>
						<input type="submit" value="<?php esc_attr_e( 'Set password', 'ultimate-member' ); ?>" class="um-button" id="um-submit-btn" />
					<?php } else { ?>
						<input type="submit" value="<?php esc_attr_e( 'Change password', 'ultimate-member' ); ?>" class="um-button" id="um-submit-btn" />
					<?php } ?>
				</div>

				<div class="um-clear"></div>
			</div>

			<?php
			/**
			 * Fires at the end of the password change form.
			 *
			 * @since 1.3.x
			 * @hook um_change_password_form
			 *
			 * @param {array} $cp_args Change password form arguments.
			 *
			 * @example <caption>Add hidden field at the start of the change password form.</caption>
			 * function my_custom_change_password_form( $cp_args ) {
			 *     echo '<input type="hidden" name="my_custom_cp_input" value="1" />'
			 * }
			 * add_action( 'um_change_password_form', 'my_custom_change_password_form' );
			 */
			do_action( 'um_change_password_form', $args );
			/** This action is documented in includes/core/um-actions-profile.php */
			do_action( 'um_after_form_fields', $args );
			?>
		</form>
	</div>
</div>