i forgot the password to my account

can anyone tell me how to hack a yahoo email? i bought a VERY good aqworlds account recently and when i tryed to change the password it said i hit a wrong key so now i dont know what i put and i cant change the email or retrieve the email because the person i bought it from said it was his friends account that she gave to him.

the account i bought is
AdventureQuest Worlds: Character Profile Page

if anyone can please tell me how to or provide information on hacking the yahoo email id be grateful seeing as it cost me 50$ to buy this >.<

@_@ i know its awesome i spent 50$ on it

send a mail to the email u accidentally put in?

There's a Chance You May Have Been scammed?
Other Then that you should've taken the email too