the best way to quit gambling is not visiting the place or browsing to the sites and its better you stay away from any of device you use to connect internet and doing another activity before you can start new things. i think it will works if you have a friends that is beside you when you start new things so you don't thinking about playing gambling and then after you can calm down your minds from gambling, you can go to trading sites and register and start to trading. maybe this is not work but at least you can try to quit from gambling and start new habit.
That would help you not to gamble online but as long as that feeling is still inside you will still find a way to gamble, what you need to do is accept that reality that gambling is not for you and when you gamble you will only ruin your life. There are a lot of ways to gamble and it's not only possible online so if that urge to gamble will not be eliminated you will still gonna gamble again.