After purchasing & downloading order page from Hostbill Licenses Client Area

Extract downloaded archive contents in main HostBill directory on your server
In HostBill, proceed to "Settings->Products & Services"
Select existing Order Page, or create new one
Click on "Edit this Order Page"
Click on uploaded orderpage to activate/select it
This orderpage offers some customization you can do from admin panel.
Areas available to modify:
To modify editable areas, click on "Customize", enter your custom texts:
Save changes to save orderpage settings.

You can now edit your products under this orderpage, following product description setup:

Will result in following order page layout:

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