regluit/frontend/templates/registration/user_change_form.html

{% extends "registration/registration_base.html" %}
{% block title %}Change User Data{% endblock %}
{% block doccontent %}
<div id="registration">
<h1>Changing your Username.</h1>

<p> If you change your Username, the web address for your profile page will change as well.</p>

<p> <b>Your current Username:</b> {{ user.username }}</p>
<form method="POST" action="">
    {% csrf_token %}
    {{ form.as_p }}
    <input type="submit" name="submit" value="Change" id="submit">
</form>
<p><a href="/accounts/password/change/">Change your password</a></p>
</div>
{% endblock %}