You should login to your CS-Cart admin area and go to Settings under the Administration menu..

Under General settings, you should check the boxes next to:

• Enable secure connection in checkout (SSL certificate is required to be installed on your server)
• Enable secure connection in administrator area (SSL certificate is required to be installed on your server)
• Enable secure connection for authentication, profile and orders pages (SSL certificate is required to be installed on your server)

This will enable SSL connection in your checkout, admin area and authentication, profile and orders pages.

You should click the Update button at the bottom of the page to save the change.

If you don’t have an SSL certificate yet, you can purchase one from us at FastWebHost SSL Certificates