How to stop this charge on my card?

So i signed up for this gaming website and it was supposed to be free, though it said it needed my card info just to prove i was over 18(yes it's one of those gaming websites, i was curious) anyway, I tried out the website didn't really like it so without thinking i closed the tab and figured that would be... show more So i signed up for this gaming website and it was supposed to be free, though it said it needed my card info just to prove i was over 18(yes it's one of those gaming websites, i was curious) anyway, I tried out the website didn't really like it so without thinking i closed the tab and figured that would be the end of it. However i look at my card account and it took 40 bucks and now i want to cancel the account but i can't remember what the website was and it's not in my history. Is there a way to cancel future charges on my account. I've been trying to find the website to log back in but i can't remember.
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