如何在Bootstrap的模式头中添加3个元素？

<div class="container">
  <nav class="navbar navbar-expand-lg navbar-light bg-light">
    <!-- 导航栏品牌元素 -->
    <a class="navbar-brand" href="#">品牌名称</a>

    <!-- 导航栏链接元素 -->
    <ul class="navbar-nav">
      <li class="nav-item">
        <a class="nav-link" href="#">链接1</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">链接2</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">链接3</a>
      </li>
    </ul>

    <!-- 导航栏表单元素 -->
    <form class="form-inline">
      <input class="form-control mr-sm-2" type="search" placeholder="搜索" aria-label="搜索">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">搜索</button>
    </form>
  </nav>

  <!-- 其他内容 -->
  ...
</div>