regluit/frontend/templates/ml_status.html

{% if request.user.profile.on_ml %}
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<form id="ml_unsubscribe" action="{% url 'ml_unsubscribe' %}" method="POST">
{% csrf_token %}
<input type="submit" name="ml_unsubscribe" value="Unsubscribe" />
</form>
{% else %}
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<form id="ml_subscribe" action="{% url 'ml_subscribe' %}" method="POST">
{% csrf_token %}
<input type="submit" name="ml_subscribe" value="Subscribe" />
</form>
{% endif %}