If you need to change the e-mail address connected with your personal account "Autodesk ID" used to access Autodesk web/cloud services, edit it in your profile.
Log in to accounts.autodesk.com with your login name and password and go to the PROFILE tab. In the upper section "Profile", click on "Edit profile" and change the e-mail address used for communication with your collegues and other users of web services you are logging in with your Autodesk ID. Save the changes.
Then in the bottom section "Account Info", use the the "Edit Account" link and set your new changed e-mail address - this contact will be used for internal communication between Autodesk and you (e.g. for Subscription). Both addresses can differ. If you entered no address in your profile (upper), will your account address (botttom) be used as a backup contact also for communication with other users, for sharing documents, notifications, etc. Again, save the changes.