Creating the certificate package
When you have the certificate, copy and paste the contents of the certificate file into the file containing the private key. It should look something like the following (only much longer). The file must have a *.pem extension.
-----BEGIN RSA PRIVATE KEY-----
Proc-Type: 4,ENCRYPTED
DEK-Info: AES-256-CBC,F6F1F37584D8189C97F23F9DCD431B42
qwabUGR9ag09wq1nDtsB3hSuXtJdOBhEn3Wok6qrIWqE8VL8Ss5N7U4MNIWA4G9A ...
-----END RSA PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
MIID4zCCAsugAwIBAgIJALwLp6+xV13iMA0GCSqGSIb3DQEBBQUAMIGHMQswCQYD
VQQGEwJERTEXMBUGA1UEBwwORnJhbmtmdXJ0L01haW4xEzARBgNVBAoMCkRaIEJB
OoD8y9uFwL24rdqR7lCAC5PdPYlf594yOwbUaIVfxBo46vnzmJO3 ...
-----END CERTIFICATE-----