Recovering my yahoo mail

Hello,
mam/ sir
I just want to ask you because i have a problem to recover my facebook account and it is connected with my yahoo mail and i just go to my yahoo mail and it has a verification code but number on it has gone since i have new number how can i changed the number so i can open my account in yahoi mail and i can recover my account in facebook?? I need to recover my facebook soon cause it has a important pictures on it. Please help me.