To assign a certificate you have created or obtained to a site
In the Administrator, connect to the server, then click the Server tab.
In the left pane, click the Site you want to configure.
In the right pane, click the Connection Options tab.
Select the Enable explicit SSL connection check box or the Enable implicit SSL connection check box or both.
In the Certificate file path box, specify the certificate file to use.
Select the private key by clicking the browse button next to the Private Key file path.
Enter the Private Key Passphrase. The passphrase must match the passphrase that was used when creating the certificate.
Click Apply.