From the Admin's Console, click Server.
Click Security.
Click the Certificates link.
Click the Install link next to Install/Renew Certificate.
Click the Add new certificate button at the bottom of the screen.
Copy the certificate and key and paste them into the appropriate box.
First, in the box with the subject "Paste the new certificate in the PEM format (for Apache + mod_ssl) here" paste your certificate with your dominname.crt from the zip file.
Next, in the box containing the subject "Paste the corresponding cryptographic key in PEM format here" place your private key that you previously generated.
If you have placed a pass phase on the certificate request in the box with the subject "Enter password here" place your password you have specified in this field.
In the box “Optionally, put your intermediate certificate chain here (in the PEM format)” place the intermediate from the zip file in this box.
For an example, see the screen shot below:
7. Click the Go! button.
You will return to the original SSL Server Certificate install screen and you should see the new certificate that you just installed.