Hi, I'm not a WA_pro, and don't have this CMS software, but the directions should all be in the CMS 'Getting Started Guide'
There should be a file in your admin/ folder that you need to access one you have all the files installed and configured correctly as per instructions.
The file you will need to access will be mentioned in your Getting Started Guide. Some of the WA people will respond soon and give you fuller instructions if you need them.
But I would make and upload an index.html or index.php file if only to hide your installation.