You should include the default styles and the javascript support in your base template.

For convenience, a sample HTML template has been provided for a generic dialog, and should be included as well.

<link rel="stylesheet" href="{% static 'frontend_forms/css/frontend_forms.css' %}">
<script src="{% static 'frontend_forms/js/frontend_forms.jsx' %}"></script>
<script src="{% url 'frontend_forms:javascript-catalog' %}"></script>

{% block modals %}
    {% include 'frontend_forms/dialogs.html' %}
{% endblock modals %}

Since the js code uses the class keyword, you might want to transpile frontend_forms.jsx with Babel for maximum compatibility, to support oldest browsers. Alternatively, include frontend_forms.js instead, which has already been transpiled for you.

Since v0.2.1 it is mandatory to include the dynamically generated javascript catalog, as a few messages have been translated in javascript code following these instructions:

Django Internationalization: in JavaScript code.