To import a certificate in to your trusted certificates database, open the
certificate manager by selecting Tools -> Manage Certificates...
option from the menu bar. This will open the Manage Certificates
dialog. Click on the Import
button. This will open a file dialog
titled, Select a File
.
Select the file containing the certificate(s) that you would like to import.
Make sure that the file is in DER/PEM encoded format and click on the Open
button. This should import the certificate(s) in to your trusted certificate
database. If the import fails for any reason, the cause for the failure will
be displayed.