i want to change my password bcs someone has discoverd it but i forgot my yahoo password

hey .. these days someone is playing on my account and i have never shared my password to anyone i know and he is making me lose alot of games and making me take queue banns for 20 min and that's very annoying when i tried to change my password i discoverd that i have to sign in to my old email to verfiy the link but i forgot its password cause i made it 6 years ago and i have new gmail now .. so how can i change my pass and email .. i have all information of my account
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