app/templates/signup.html

{% extends "base.html" %}
{% from 'macros.html' import render_form %}

{% block content %}
<h2>Sign up</h2>
{% include 'flash_messages.html' %}

{{ render_form(form, action_url=url_for('signup'), method='POST', btn_class='btn btn-primary',
   action_text=_('sign up')) }}
<!--
<form action="{{ url_for('signup') }}" method="POST" class="form-horizontal" role="form">
   {% include 'forms.html' %}
</form>
-->
{% endblock %}