djangoMarcador/templates/toggle_login.html

{% if user.is_authenticated %}
<ul class="nav navbar-nav navbar-right">
    <li> <a href="{% url 'marcador_bookmark_create' %}">Create bookmark</a> </li>
    <li class="dropdown">
        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">
            {{ user.username }}
            <span class="caret"></span>
        </a>
        <ul class="dropdown-menu" role="menu">
            <li>
                <a href="{% url "marcador_bookmark_user" user.username %}">My Bookmarks</a>
            </li>
            <li>
                <a href="{% url "djangoMarcador_logout" %}">Logout</a>
            </li>
        </ul>
    </li>
</ul>
{% else %}
<form class="navbar-form navbar-right" role="form" action="{% url "djangoMarcador_login" %}" method="post" accept-charset="utf-8">
    <!--<div class="form-group">
        <input type="text" placeholder="Username" class="form-control" name="username">
    </div>
    <div class="form-group">
        <input type="password" placeholder="Password" class="form-control" name="password">
    </div>-->
    {% csrf_token %}
    <button type="submit" class="btn btn-success">Sign in</button>
</form>
{% endif %}