Hi Megan,
Thank you so much for reaching out! It looks like you're enrolled in the CDA course, so you actually won't need to enter a product key for your course. You should be able to just log into your account with the email address you used when you signed up for your course, but if you are still having trouble, you can reach out to our Customer Support team via email at contact@teachstone.com, or by using the orange "Chat with Support" button in the lower right hand corner here in the CLC! I hope this helps.
Best,
Allison