To enable SSL, you must first obtain an SSL certificate for your domain.
For IIS there are many tutorials available on the web and the instructions vary depending on the IIS version. Please refer to these Google results.
The IntraWeb standalone servers are built using Indy. Indy uses OpenSSL and you will need to convert the certificates for use with OpenSSL.
You will also need to download the OpenSSL libraries.
Testing Certificates Locally
Certificates are bound to a domain name such as www.atozed.com. To test locally, make a fake entry for your domain name in your HOSTS file for 127.0.0.1, and then access your application using the domain name.