How do I add a contact or enquiry form?

Use the Form Builder (Settings → Contact Forms) to build a custom form: contact, enquiry, anything you need. Each published form is shown at its own address on your store (/form/ followed by the form's slug).

Add a link to it from your menu or a page. To keep bots away, use the reCAPTCHA plugin: add your Google site and secret keys and tick Contact & custom forms (Form Builder). Then, in the form's settings, turn on Protect this form with reCAPTCHA and add a Recaptcha field to the form, so the checkbox has somewhere to appear.