If you have not yet created a Certificate Signing Request (CSR) and ordered your certificate, see SSL Certificate CSR Creation | Lotus Domino Go.
For each of the three SSL Certificates, follow the steps below:
Preparing your Primary Server Certificate:
Open your primary Certificate (your_domain_name.crt) in a text editor and save a copy of this file in .txt format. Name this file "your_domain_name.txt".
Preparing the Root and Intermediate CA Root Certificates:
Open the Intermediate Root SSL Certificate (DigiCertCA.crt) in a text editor and save it by the same name but as a .txt file. Do the same thing for the Root Certificate (TrustedRoot.crt).
Make sure your text files include the full certificate as in the example below:
-----BEGIN CERTIFICATE-----
text ...
------END CERTIFICATE-----
Click X to exit the menu.
Installing your Primary Server Certificate:
Click C to create a stash file for the Key Ring
Enabling SSL on your Domino Go Web Server
Restart your Lotus Domino Web Server