Generate Keys and Certificate Signing Request
1. Open Website Server Properties and select the Key Ring tab.
2. Select New Key Pair and follow the wizard. Ensure all the details you enter are correct.
3. When you have completed the wizard, select Done. Do not select the box to choose a Certification Authority.
4. When enrolling for a Certificate locate the CSR file and copy/paste the Certificate Request text into the CSR box. Complete the online enrollment process.
For info on installation, read here.