I guess that this is explained somewhere, but I'm not able to find in the manual where should I put the credentials that I have after paying for Zorro (monthly payment)

I have my username and password but I don't know where to put it to activate Zorro S

Zorro needs no credentials, but you should have got a key and unlock instructions together with them.

Woops, I didn't saw in the email the sentence "unzip the key file (keyxx.dta) directly into your Zorro folder"

OK, thanks!