Do you mean that you obtained an EIN from the IRS at a time when you did work as an independent contractor and did not want to provide your Social Security number to someone else? If that is what you mean -- look through your old tax returns for the ID number on the worksheets that pertain to any work you did as an independent contractor.
You have to access your own account and print it for yourself using exactly the same account and user ID that you used when you prepared the return.
Many people have multiple TT accounts and forget how to access them. Log out of the account you are in now.
Or did you use the desktop version of TurboTax? If so, the files are on your own hard drive or any backup device you used like a flash drive.
To get a copy of your previously filed returns prepared with online TurboTax https://ttlc.intuit.com/questions/1900748-how-do-i-get-a-copy-of-a-return-i-filed-in-turbotax-online