I think there's an option to purchase it in "Extra Content" for either 100 or 600 GP (you earn 10GP I think for every win).
The quit prevention system is silly - it would be fantastic if it worked correctly, but IMO it doesn't right now. I can play game after game on FIFA 12 fine, lag free. But on PES, two games in a row I've been forcibly disconnected by the game, with no warning or anything I could do to stop it, because "network stability has significantly worsened" - on the second game, there wasn't even any visible lag, so I don't know why I was disconnected.
This wouldn't be so bad, but you then get a message that you need a 70% match completion rate over 10 games or you'll have various restrictions applied online. This again would be fine, but apparently these forced disconnects count as me quitting a game, despite the fact I couldn't do anything to prevent the game booting me to the menu.
So now, I have to hope that 7 of my next 8 games manage to avoid these silly forced disconnects, or I'll basically be branded a cheater. Since the game has logic that decides when the network is too unstable, and kicks users, then why couldn't they implement a check that says "if forcibly disconnected by the game due to network, don't alter DNF percentage. If disconnected any other way, alter DNF percentage." That would have made more sense.