JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.0/jquery.validate.min.js"></script>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.0/additional-methods.js"></script>
<form action="#" class="send_form" id="forgot_pass_form" method="POST">
    <fieldset>
        <div class="send_row">
            <label class="padding-top10">Email</label>
            <input type="text" class="send_email send" id="email" name="email"
            /> <em>You need to type an email address</em>

        </div>
        <div class="send_row option">OR</div>
        <div class="send_row">
            <label class="padding-top10">Username</label>
            <input type="text" class="send_username send" id="uname"
            name="uname" />
        </div>
        <div class="send_row send_submitforgotuser">
            <input type="submit" value="Submit" />
        </div>
    </fieldset>
</form>
<a id="docs" href="http://docs.jquery.com/Plugins/Validation" target="_blank">Validation Documentation</a>

CSS

#docs {
    display: block;
    position: fixed;
    bottom: 0;
    right: 0;
}

JavaScript

$(document).ready(function () {

    $('#forgot_pass_form').validate({ // initialize the plugin
        groups: {
            names: "uname email"
        },
        rules: {
            uname: {
                require_from_group: [1, ".send"]
            },
            email: {
                require_from_group: [1, ".send"]
            }
        },
        submitHandler: function (form) { // for demo
            alert('valid form submitted'); // for demo
            return false; // for demo
        }
    });

    jQuery.extend(jQuery.validator.messages, {
        require_from_group: jQuery.format("'Please enter either username/ email address to recover password'/Please fill out at least {0} of these fields.")
    });

});