Display text block on product page only for logged out customers

[Baggio]

I have this Online Store 2.0 supporting theme and I have added a text block to product page that should only be visible to logged out (guest) customers. 

I found this code:

{% if shop.customer_accounts_enabled %}
  {% if customer %}

  {% else %}
    HERE GOES TEXT BLOCK

  {% endif %}
{% endif %}

I was wondering what how exactly should I use this code and in what file, or do you have other suggestions of how to achieve this?

[niraj_patel]

{% if shop.customer_accounts_enabled %}
  {% if customer %}

{% if template == 'product' %}
  {% else %}
    HERE GOES TEXT BLOCK
{% endif %}

  {% endif %}
{% endif %}