AddALoginFormOnYourWPTheme.html

<?php if ( !(current_user_can('level_0')) ) { ?>
   <h2>Login</h2>
   <form action="<?php echo get_option('home'); ?>/wp-login.php" method="post">
      <input
        type="text"
        name="log"
        id="log"
        value="<?php echo wp_specialchars(stripslashes($user_login), 1) ?>"
        size="20" />
      <input type="password" name="pwd" id="pwd" size="20" />
      <input type="submit" name="submit" value="Send" />
      <p>
         <label for="rememberme">
            <input
              name="rememberme"
              id="rememberme"
              type="checkbox"
              checked="checked"
              value="forever" />
            Remember me
         </label>
         <input type="hidden"
                name="redirect_to"
                value="<?php echo $_SERVER['REQUEST_URI']; ?>" />
      </p>
   </form>
   <a href="<?php echo get_option('home'); ?>/wp-login.php?action=lostpassword">
      Recover password
   </a>
<?php } else { ?>
   <h2>Logout</h2>
   <a href="<?php echo wp_logout_url(urlencode($_SERVER['REQUEST_URI'])); ?>">
      logout
   </a>
   <br />
   <a href="<?php echo get_option('home'); ?>/wp-admin">admin</a>
<?php } ?>