> For the complete documentation index, see [llms.txt](https://help.calcumate.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.calcumate.co/calculator-setup-and-customization/step-1-initial-set-up/call-to-action-url.md).

# Call to action URL

The call to action URL can be set:

* As a default for all URLs on the calculator
* Per storage unit type

To change the default call to action URL for the calculator, [login](https://help.calcumate.co/calculator-setup-and-customization/step-1-initial-set-up/www.calcumate.co/login), select the calculator you would like to edit, and update the "Call to action URL field":

<figure><img src="/files/gMfnvVCuxO1pTqJEaDtf" alt=""><figcaption></figcaption></figure>

To change the call to action URL for individual storage unit types, [login](https://help.calcumate.co/calculator-setup-and-customization/step-1-initial-set-up/www.calcumate.co/login), click into the individual storage unit, and edit the "URL to reserve" field:

<figure><img src="/files/QQlHZi7UWeEsRNTWrgA2" alt=""><figcaption></figcaption></figure>