To install your SSL certificate, you will need to do the following:
Step 1: Install the Intermediate Certificate
Download the appropriate intermediate certificate and save as intermediate.crt on your server:
From the Admin screen on your web server select Security, Certificates, Intermediate CA Certificate. The screen shows you a list of any intermediate certificates you currently have installed, as well as allowing you to install a new intermediate certificate.
Select Browse and search for the intermediate certificate you have saved on your server, click OK, then Install.
Step 2: Install the SSL Certificate
Copy and paste your SSL certificate from the email and save it locally as a .crt file e.g. ssl_cert.crt.
From the Admin screen on your web server, select Security, Certificates.
Select Browse and search for your SSL certificate you have just saved.
When you locate your SSL certificate click OK.
Finally select the Install button; this will install the certificate on to your web server.
Step 3: Selecting Connections for SSL
You can select which connections you would like to use an SSL connection for. This is done via the SSL screen in the Security menu:
Select Security, then SSL.
Select which connections you would like to use SSL for using the check boxes, when you have made your selections click Apply.
Step 4: Selecting certificate interface
You can also select which interface you would like to use your SSL certificate for. If left blank, the certificate will operate on the primary system interface.
From the Admin screen select Security, Certificates, Interfaces.
Enter the Interface you would like to use the SSL certificate on, this can be a fully-qualified domain name (FQDN) or an IP address.
Once you have entered the FQDN or IP address, click Set.