Unlink yahoo email account from my iphone "mail" REMOTELY

Hi, does anyone know how to remotely unlink my yahoo account from my iphone mail? Lost my iphone, change the mail password already but apoarently i use single log in on my mail so that emails keep coming to my mail eventhough i change my yahoo mail password. I tried on my friends iphone there just email notification saying i changed my password but the mail doesnt ask for the new password. Pls help