duda

hola, estoy introduciendome en django por lo que tengo algunas dudas, quisiera sabes como es que se usa UserChangeForm ya que cdo trato de accecer al link de
 password = ReadOnlyPasswordHashField(label=_("Password"),
        help_text=_("Raw passwords are not stored, so there is no way to see "
                    "this user's password, but you can change the password "
                    "using <a href=\"password/\">this form</a>."))

me muestra el sgte error :Exception Type: TemplateDoesNotExist
                                      Exception Value:registration/password_change_done.html
                                      Exception Location: C:\Python27\lib\site-packages\django\template\loader.py in find_template, line 139

esta es mi view.py:
#Editar usuarios
@login_required(login_url='/ingresar')
def editar_usuario(request):
    if request.method == 'POST':
        formulario = UserChangeForm(request.POST)
        if formulario.is_valid():
            formulario.save()
            return HttpResponseRedirect('/')
    else:
        formulario = UserChangeForm()
    return render_to_response('nuevousuario.html',{'formulario':formulario},context_instance=RequestContext(request))

el html:
{% extends 'baseAdmin.html' %}

{% block content %}
<form id="formulario" method="POST" action="/usuario/editar">
    <div align="center">{% csrf_token %}
        <table>
            {{ formulario }}
        </table>
    </div>
    <p align="center"><input type="submit" value="Editar"/></p>
</form>
{% endblock %}

el url:
urlpatterns = patterns('',
                       url(r'^usuario/nuevo$','Administracion.views.nuevo_usuario'),
                       url(r'^usuario/editar$','Administracion.views.editar_usuario'),
                       url(r'^ingresar/$','Administracion.views.ingresar'),
                       url(r'^privado/$','Administracion.views.privado'),
                       url(r'^cerrar/$', 'Administracion.views.cerrar'),
                       url(r'^password/$', 'django.contrib.auth.views.password_change_done'),

Tambien me surge la duda sobre PasswordChangeForm da el mismo error y por ultimo pero no menos importante quisiera saber si existe una forma de gestionar los usuarios (eliminar, insertar y modificar) qu no sea habilitando el modulo de administracion, lo mismo para los grupos
gracias

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