Django - tutorial part 2 problem - Permission denied when attempting to save file

Got this error
Ran into this as part of the Django tutorial (part 2) very close to
the bottom .... an attempt to change the page header/title.

"There was an error attempting to save 'base_site.html':Permission
denied"

when trying to save the file below (copied from django source code)

{% extends "admin/base.html" %}
{% load i18n %}

{% block title %}{{ title }} | {% trans 'Django site admin' %}{%
endblock %}

{% block branding %}
<h1 id="site-name">{% trans 'Django administration' %}</h1>
{% endblock %}

{% block nav-global %}{% endblock %}

any thoughts?

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