Right top corner of the webpage, your profile name would be displayed. Take your mouse over it, it will show you a dropdown. Click
My Settings
in it and you will find options to update email address.
Or try this (alternate):
Your Settings[
^]
In case you are still unable to, drop a message here:
Bugs and Suggestions[
^] - monitored by CP Admins, they will help in case of any issue.