How do you switch the question?

Well I have 2 yahoos. I have my friend one and my school one. this one is my friends one and ive had it for a while and ive memorized the pword. i just made my friends one and i forgot to write the pword down...fail. so i clicked forgot my pword and it gave me the security question...im 13 and the question was "Whats the nickname to your oldest child?" uhmm how should i know that? i had my cousin answer that....it was Dana....shes like a daughter to me... uhmm unless he spelled it daana (which i tried and doesnt work) he entered the wrong thing and doesnt remember what he put....BUT they have another security question.....how do i get to that?? because i made that one my pets name or whatever...i need help :/