Hello @beinternetwebdev

A CNAME record is only needed if you plan to use cdn.<yourdomain>

A quick google search will give you results for adding CNAME records in DNS. Try searching for “how to add a cname record in ….” (replace …. with your domain registrar)

Here’s a quick howto:
Create a new CNAME record,
Enter CDN in the HOST field
Enter amazon cloudfront provided URL (E.G: rAnd0mChA6s.cloudfront.net) in the points to field.
Save and wait for the DNS to propagate

Hope this helps