Firstly, get the root certificate. Then follow the steps below:

Procedures:

  • Double click the certificate file (with ".cer" extension)
  • Choose "System" from the keychain option. Then press "OK"
    The image illustrate how to add root certificate to Mac OS X
  • When the following window pops-up, click the "Always Trust" button.
    The image illustrate how to add root certificate to Mac OS X
  • Then you will notice that the certificate is added to the system entry.
    The image illustrate how to add root certificate to Mac OS X