Have what checkbox(es) checked?
Most likely is that you do the checking and UI presentation live in the browser using javascript. If necessary the javascript can query and update the database using AJAX.
This is contact form checkboxes
OK, now *which contact form*? Perhaps you could be a bit more forthcoming with your responses. How are you creating the contact form?
I am using Formcraft plugin.
I recommend asking at https://wordpress.org/support/plugin/formcraft-form-builder#new-post so the plugin’s developers and support community can help you with this.
