Hi Mads,

thank you for reaching out to us!

To add a link to Terms & Conditions, you need to add the "Text Content" custom field, like this:

Then, you need to add a mandatory checkbox custom field, where they have to agree with the terms and conditions when they book:

If you want to open the page with Terms and Conditions in a new tab, please use this element instead of the one that you can see on the first picture:

Please check our <a href="http://www.yourdomain.com/" target="_blank">Terms and Conditions</a>.

You can change the "Please check our Terms and Conditions", in the element.

I hope this helps