Please sign in your account via social media and click My Alibaba-My Account to find your member ID (account ID) .
Then on the account page, you can also find the email address and other information quickly.
Please be noted kindly that the member ID is the Alibaba.com account ID which can not be changed once the account was created. And the member id can also be used to sign in Alibaba.com account.
However, if you cannot log in your account successfully, please contact Customer Service Team and provide as much information as you can, so we could try to locate the account to help you solve the problem, such as:
Email address
Order number
Inquiry ID
RFQ ID