On macOS, you can import a trusted certificate into Keychain Access as follows.
|1.||Run Keychain Access.|
|2.||Click System, and then click Certificates.|
|3.||On the File menu, click Import Items.|
|4.||Browse for the trusted certificate, and click Open.|
|5.||Enter the Keychain Access password when prompted, and then click Modify Keychain.|
|6.||Double-click the certificate, expand the Trust section, and select Always Trust.|
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