# I changed the theme, i used to have "book now" buttons, now I see "add to cart"

Why does changing my theme break the cowlendar application?

The way that Shopify works is that whenever you change the theme, all apps will be disabled.

You will need to go into your theme editor and reenable Cowlendar to get things going again. :wink:

Go into your Shopify admin panel Online Store > Themes > Customize and on the left side click on the App Embed section (5), then enabled Cowlendar (6) and lastly click Save (7)

<figure><img src="https://1413666222-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FB7xH6fep0zIUsqsS8lgV%2Fuploads%2F93HNHoPl8hvqjcuYhbxc%2Fimage.png?alt=media&#x26;token=cdf1b463-264b-4cec-bc3f-badb64356cb3" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
For a more detailed explanation visit the guide below
{% endhint %}

{% content-ref url="../beginners-guide/enable-cowlendar-on-your-theme-mandatory" %}
[enable-cowlendar-on-your-theme-mandatory](../beginners-guide/enable-cowlendar-on-your-theme-mandatory)
{% endcontent-ref %}
