You can change your email address on any site page. You use your email address to sign in to your account.
At the top of any page, select the dropdown menu icon next to your username. Select 'edit profile'. In the Email Address field, select your current email address and replace it with the new address.
If you do not receive a confirmation email, make sure that you typed the email correctly (you can complete the above steps again. ) or check your Junk / Spam folder.