Attaching a CMS site to GoDaddy with SSL licence

My customers has a domain with GoDaddy and has bought an SSL licence with them, what settings do I need to make to accommodate their site as SSL?
Thanks.

@Hywel - Is this site hosted at Godaddy?

No, it’s a CMS, hosted at Webflow.

At this time you can’t use a custom SSL certificate on a hosted webflow site. Webflow provides an autossl certificate via LetsEncrypt when you enable SSL. So if you want SSL, just enable it and update your DNS settings.