Your certificates are securely housed in GreenlightLocker.com, not in EdReady itself.
EdReady has a convenient link to Greenlight on the My Achievements page, but that is only for students who are active in the program. After you graduate or your school removes your access to email or your Texas College Bridge account, you will still be able to get your certificates in Greenlight Locker.
If you have previously seen your certificates in Greenlight Locker, then you can simply go to GreenlightLocker.com and log in. From there, you can share your certificates securely with colleges or print/share non-secure copies.
If you do not have an account in Greenlight Locker, or if have any issues with the certificate after you get logged in, please use this form to request assistance:
https://texascollegebridge.edready.org/hc/en-us/requests/new?ticket_form_id=5009667878167