How to import a valid copy of your electronic certificate
Skip information indexMacintosh - Import copy of certificate in Safari
If the operating system is Macintosh and the browser is Safari, the electronic certificate must be installed in "Keychain Access" on Mac. Launch the application from "Finder", "Applications", "Utilities", "Keychain Access".
Go to "Login", "My certificates" and click on "File", "Import items" or "Import items", depending on the version.
Select the .p12 or .pfx file with the backup copy of the electronic certificate and click "Open".
If necessary, you will have to provide the password that was established when exporting the certificate.
If the import is successful, the certificate will appear in "Keychain Access".