Hi Kumarararaja,
Is your login tied to an Adobe ID or an Enterprise ID?
If the login in an Adobe ID, you should be able to visit account.adobe.com -> edit your profile -> change primary email address.
If your login is tied to an Enterprise ID, I don't believe we can migrate your user since the login is owned by your organization. If this is the case, you can always create a new Adobe ID (free for anyone to create) and continue participating on the forums. Unfortunately you would be starting over with points, subscriptions, & notifications.
Thanks,
Jantzen