How can i update my email address?

I would like to update my update my email address to peterorsuearmitage. to do away altogether with my old name 'Shlachman' My married name is Armitage. I have been trying to do this for 7 months. I have now been told to come to you NOT to tTalk Talk Thanking you in anticipation S.Armitage.(Mrs) was Shlackman