Please note that for this code to work you’ll need to have the “Account creation” settings for customers checked, in “Accounts & Privacy”.

Add this code to your child theme’s functions.php file or via a plugin that allows custom functions to be added, such as the Dessky Snippets plugin. Please don’t add custom code directly to your parent theme’s functions.php file as this will be overwritten completely when you update the theme.

This code will add a custom message above the login/register form on the user’s my-account page.

/**
 * Add a message above the login / register form on my-account page
 */
add_action( 'woocommerce_before_customer_login_form', 'jk_login_message' );
function jk_login_message() {
    if ( get_option( 'woocommerce_enable_myaccount_registration' ) == 'yes' ) {
	?>
		<div class="woocommerce-info">
			<p><?php _e( 'Returning customers login. New users register for next time so you can:' ); ?></p>
			<ul>
				<li><?php _e( 'View your order history' ); ?></li>
				<li><?php _e( 'Check on your orders' ); ?></li>
				<li><?php _e( 'Edit your addresses' ); ?></li>
				<li><?php _e( 'Change your password' ); ?></li>
			</ul>
		</div>
	<?php
	}
}