I can see no Add button or something like that? Can anyone help?
Thanks.
How to add a certificate into certificate manager?
Try sending a X.509v3 format cert file to the phone over Bluetooth and then open the received message, or download it from a web or WAP page (assuming the server has been configured to send the correct MIME type, application/x-x509-ca-cert).
Or copy it to the phone and open in file manager.