You cannot claim a SuperEnalotto prize from abroad; instead, you have to claim your prize in person from either a ticket retailer in Italy, one of the lottery operator's regional offices, or one of the dedicated payment centres.
The winning combination consists of 6 numbers plus the extra Jolly number, which is drawn after the first 6 from the same set. To win, you need to guess 2, 3, 4 or 5 of the 6 numbers of the winning combination.