I would like to update my account by paying a new month but I do not understand the meaning of “codice buono” at the end of my payment. What should I write there? What kind of “codice” is it?

If you have a coupon code, you can enter it here. Otherwise you can just leave it blank and upgrade. If you are upgrading for the first time, you can use the code “UPSAVE500” to receive a free 500 points.

when I update my account, and enter the code on my card, this value will automatically discount every month?
and this value in U.S. dollars, wanted to know is in quat 'cause I’m the real Brazil.

The monthly fee for a Basic membership is USD 10. The coupon I mentioned above gives you a one time upgrade bonus of 500 points.