Open any instance of Alpha server -- best if you do this on the server you intend to configure for the application you want to protect. But you it does not have to be the one that needs the SSL Certificate. It does not even need to be on the same server and can even be done on the Development server if convenient.
Click to Generate a Self-signed Certificate
Enter in values for the fields Country through Comment and then Paraphrase. You will not need to know the values other than the Paraphrase which you will need to retain.
The Common Name is the most important and needs to be the domain you are protecting, without http or https. You should enter the domain only, without http or https or www.
Accept other defaults
Change output directory to c:\aa\ssl.
Click Create Self-signed Certificate. Then close the dialog(s).
Go to the c:\aa\ssl folder and find the two new files, domain.crt and domain.key.
Open the one named domain.crt using Notepad or similar.
Copy-paste the text body to the SSL Certificate vendor. You will not need this file again and can leave it in place or archive it.