If you have purchased an SSL certificate and had us install it, you can force your website to use HTTPS much like you can with forcing a specific domain on your website.
Go to your website management tools. Click on Add/Remove Addresses
Once in the Addresses area, look fro "Force HTTPS only" on your primary domain.
If you set this in error because you don't have an SSL certificate installed, you can remove it in the same place.
Please ask the help desk for assistance with your purchase and installation of a certificate for SSL to use HTTPS.