Hi Sara,
Thank you for contacting us.
For example, you can wrap the field value in a <a>
tag and a <button>
tag to make the button clickable.
<a href="<?php echo rwmb_meta( 'field_URL_id' ); ?>">
<button>Click me!</button>
</a>
Please follow this documentation to know how to output the field value https://docs.metabox.io/displaying-fields/.