Install wildcard SSL on SDP

Hi Forum,

We wan to install a wildcard SSL e.g *.contoso.com on SDP. I reviewed the installation guidelines on the following link; http://www.manageengine.com/products/service-desk/help/adminguide/introduction/install-ssl.html

However they divide it in 4 steps mainly :

Step 1: Create a Keystore file
Step 2: Create .CSR (Certificate Signing Request) file
Step 3: Install your SSL Certificate
Step 4: Configuring the Server

I already have the *.contoso.cer file. I cannot do another request for the same domain. Is there a way to install the wildcard certificate on the SDP?

Am I doing something wrong.

Comments and suggest will be appreciated.