From what i see with just a simple google search is this is a browser MMORPG correct?
THEREFORE,
99% of theese games save your info ("for like Silver,Gold Coupons, Vitality") server side. Hacking server side would require you to hack their network and edit your stats on their local machine. That is highly illegal(If you want that your on the wrong forum ) The risk is not worth you having some extra coins in a game.
I hope you can understand my explanation how this cannot be done.