Fingerprint, the AirPrint enabling app for your computer?
There is no configuration on the iPad. It's all done on the computer. Once you do so the Print option in Mail on the iPad should see any printers you've enabled on the computer.
Any failure to see this will be a problem between the printer, computer, router, or the iPad's network connection. There is nothing you can do in the Mail app (or other apps) that will make a bit of difference.
The only possible reason I can see for you to get directed to reply to something in Mail would have to do with validating your copy of Fingerprint on the computer. There was a recent update that will only work with Windows 7 and up (if I remember correctly). You could get a reduced price.
I don't use Fingerprint, but replying to a confirmation email is a common way to enable download or licensing when you upgrade apps on a computer.