Πώς μπορώ να αλλάξω τον αριθμό τηλεφώνου που είναι αποθηκευμένος στο Outlook?

How can I change my phone number which is permanently stored in my outlook account? This english number is my old one, and every time that I forget my password the verification code is sent to this old english phone number which is not used by me anymore. I would like to delete this phone number and to add my new one, so that to be able to edit my password to access my account