If you receive your certificate file make sure it has a .crt extension, if necessary rename the file like cert.crt and store it ont he server machine.

1. Run the Security Manager application
2. Select the folder that corresponds to the type of certificate you are installing. (Select the Trusted folder for the intermediate certificate and the User folder for the SSL certificate).
3. Select File > Install Certificate.
   Either paste the entire contents of the certificate into the box (base64 encoded certificates only), or click the Import from File box. 
   If you select Import from File, the cut and paste area is dimmed. Use the browse feature to locate the certificate.
4. Click Install.
   If the certificate is of type .crt or .p7c, it is installed. 
   If the file is a PKCS #12 type (has either a .p12 or .pfx extension) the PKCS #12 Certificate/Private Key window displays. Enter the password that allows access to the file. This is the password you entered when you generated the certificate files (CSR and private key).
5. To export the certificate and its private key at a later time you must check the Mark private key as exportable checkbox. 
6. Click Done.