If you used a legitimate e-mail and finished all the videos with the quiz at the end, you should have received a notification that you have completed the program. Within 24 hrs after the notification of completion in the expert program page, you should have received an e-mail from the HDBaseT Administration explaining what to do in order to obtain the certificate and t-shirt. The e-mail may be in your spam folder. If you did not receive the e-mail, I would suggest reaching out to admin (at) hdbaset.org with your user details, so that they can investigate.