If you already have an account, you can login to ES from your community site. Just copy the code below and place it into your site.
<br />
<br />
<textarea cols="80" rows="10" onclick="this.select()" readonly="readonly">
<form target="_blank" name="login11" id="energy_login" method="post" action="http://www.energysmackdown.com/index.php?page=login">
<strong>Login to Carbon Tracker Tool:</strong><br /><br />
  <table cellpadding="4" cellspacing="1">
    <tbody>
      <tr>
        <td align="right">User Name:</td>
        <td align="left"><input name="username" id="username" type="text" /></td>
      </tr>
      <tr>
        <td align="right">Password:</td>
        <td align="left"><input name="password" id="pass" type="password" /></td>
      </tr>
      <tr>
        <td align="right"> </td>
        <td align="left"><input name="submit" id="login" value="Login" alt="Login" title="Login" type="submit" /></td>
      </tr>
      <tr>
        <td align="right"> </td>
        <td align="left"><a href="http://www.energysmackdown.com/index.php?page=forget_password">Forgot Password?</a></td>
      </tr>
    </tbody>
  </table>
</form>
</textarea>