I Have Integrate one HTML theme in elgg,

in index.php how to login, and page can redirect at admin page.

what is the code can write for login?

<div class="toplinks">
     <ul class="links">
         <li class="sign-up"><a href="#">Sign Up </a></li>
         <li class="log-in"><a href="#"> Log in</a></li>
     </ul>
</div>