Hi there,

You will be able to do this locally on your PC, however for anyone else they would still get the warning.

If you have a Linux on your laptop you need to add your certificate to the /usr/local/share/ca-certificates/ directory and then run sudo update-ca-certificates.

And if you have a Windows PC, then you need to add the CA to the Trusted Root Certification Authorities list via the Microsoft Management Console.

What you could do instead is use Let’s Encrypt for example as this is trusted by all browsers.

Hope that this helps!
Regards,
Bobby