Click Show Certificate, then review the certificate content.
If a certificate includes a message that the certificate isn’t trusted or was signed by an untrusted issuer, or the name and organization aren’t the same as the website owner, click Cancel.
If you continue to the website, verify the address in the Safari toolbar to confirm it’s correct. Some fraudulent websites masquerade as trusted websites by changing one or two letters of the website address. The certificate is stored on your computer. You can Change Search settings in Safari on Mac