add custom url in account page

add_action(
    'jnews_after_account_nav',
    function () {

        ?>

                <div class="jeg_account_nav" style="margin-top: -25px;">
                    <ul>
                            <li>
                                <a href="http://your-custom-page-url">Custom Page</a>
                            </li>
                    </ul>
                </div>
        <?php
    }
);