How to change order after completed

Hello, I just purchased the Internet Security version for 3 years and was meaning to get it for 3 PCs for $119.99 that the website offers, but accidentally purchased the 3 years for only 1 PC.

How can I change this? Can I, and am able to get the same deal for the 3 PCs?

Submit a ticket: https://support.avast.com/Tickets/Submit

Cool thanks!

You’re welcome.