All of your certificates are stored in your account in two separate places.
One) Log into your account, and then go to Courses & Exams > Select the Course Name > Scroll down and you will see your certificate(s) for that particular course.
Two) Log into your account, and then go to Certificate > You will see each of your certificates based on the course name.
Three) Each certificate is emailed to you. If you need for us to resend that particular email simply email us and we can resend it to you.