Go to “Administration >> Advanced Settings >> Online & Email Settings >> Web Widgets & API”. Create or edit your booking widget and add the following option:

• How did you hear about us?

Scroll down to “Add HTML before the BODY tag closure” and append the following lines:

• <script> window.svr.howdidyouhearaboutus = [ 'Facebook', 'Instagram', 'Youtube', 'Google', 'Friend told me' ];
• window.svr.OnEmailValidateEvent = function() { $('#howdidyouhearaboutus').replaceWith('<div><select id="howdidyouhearaboutus" data-view="howdidyouhearaboutus" style="font-size: 1.5em;height: 50px;width:100%;" class="form-control">' + window.svr.howdidyouhearaboutus.map(function(t,idx){ return '<option value="'+t+'">'+t+'</option>' }) + '</select></div>'); } </script>

Make the option visible under the customer profiles: