Forgot yahoo mail password and can retreat it.

Greetings.
my name is Irma Torres, and I recently changed my phone and I forgot my Yahoo password. My daughter and I tried to change the password, but as she was reading it said that in order to make a new password I would receive a code to my old number. Now, I don't know what to do because me and my daughter have tried and did some research on what we can do to change the password, and we have no clue. Can you help us?