make sure you selected cPanel/WHM in your options while ordering (if you go to your client page, you can verify this by doing the upgrade/downgrade options thingie). If you did, open a support ticket.
If you have not installed CSF yet, or Webmin for that matter... the following requirements must be fulfilled for Webmin and CSF to work together nicely.
As ROOT, let's get the requirements out of the way: