Site is not secure unless someone types in “www.”

so we connected our domain with HubSpot CMS. They only support SSL for subdomains, so when someone does not type in "www." they are prompted with a security warning. They told me I needed to set up a redirect through GoDaddy for it to always go to the root domain (

In GoDaddy’s forwarding section I see one that says "Domain" and the other says "Subdomain".

What do I type in each of these boxes so that my site goes to no matter what someone types in?