To delete the DNSSEC from your domain, please follow the steps below:

1. Sign in to your Dynadot account.
2. Navigate to My Domains > Manage Domains from the menu on the left-hand side.
3. In the domain list, click on the domain name you wish to modify (which should be a blue link).
4. Scroll down to the DNSSEC section, clicking on "Clear DNSSEC", and the DNSSEC will be deleted.