Note: SSL is a paid feature and only available for paying plans. If you're on a paying plan, you may need to Enable SSL for your connected domain.
If you just set up all your DNS and the website is now live, however, the "not secure" or "privacy issue" alert is coming up, your SSL hasn't propagated yet.
This is normal behavior; your @, A record and www, CNAME records may sometimes propagate almost immediately, however it normally takes the SSL a bit more time to go live, for our system to identify it, the certificate to be issued, and your browser to identify the certificate.
If you're still having issues after 24 hours, then please reach out to us as we're more than happy to help.