Can’t get rid of the email, I chose for Alias ! Can you Hellp ? how do I change this ?

To ;   Whomever   It   May    Concern ,    I   am    having    difficulty ,    changing   my   alias   account .     Is   there    any    way,   I   can   do   this ?    and

I    am    looking    for   someplace,   to   store   my   passwords ,   can   one   of   you    help ,   me   with    this  too ?    I   appreciate   your   patience  with

me  in   the    past .