Change the trust settings of a certificate in Keychain Access on Mac
You can view or change the trust policy of a certificate in Keychain Access.
In the Keychain Access app
on your Mac, select a keychain from one of the keychains lists, then double-click a certificate.Next to Trust, click the arrow
to display the trust policies for the certificate.To override the trust policies, choose new trust settings from the pop-up menus.