如何显示youtube playlist wordpress metabox

Question

我正在使用Youtube Playlist Thumbs

<form action="add_user.php" method="post">
    <h3>Name</h3>
    <input name="name" placeholder="Name">
    <h3>Username</h3>
    <input name="username" placeholder="Username">
    <h3>E-mail</h3>
    <input name="email" placeholder="E-mail">
    <h3>Password</h3>
    <input name="password" placeholder="Name" id="password" type="password">
    <h3>Confirm Password</h3>
    <input name="confirm_pass" placeholder="Name" id="confirm_password" type="password">
    <p id="pass_state"></p>
    <input type="submit" value="Create User">
</form>
<script>
    var pass = document.getElementById("pass");
    var conf_pass = document.getElementById("conf_pass");

    function ValidatePass() {
        if (pass.value != conf_pass.value) {
            document.getElementById("pass_state").innerHTML = "Password Does not match"
        }else {
            document.getElementById("pass_state").innerHTML = "Password match"
        }
    }
</script>

它只显示插件短代码。任何想法如何解决？