Add a feature to a WordPress plugin

I am working on a website and I found the right plugin for the website.

https://github.com/Falcon90/genuine-product-checker

But I want to add a feature to it

I want the user’s search date and time to be recorded when the user first searches for a serial number, and the next time he or she searches to display a message stating that the serial number has already been queried.

Thank you for helping me guys