1. After you login to the Internet.bs interface, click on the My Account dropdown and select 'My Domains'
2. Select the domain you want to setup DNSSEC for
3. Select 'Update DNS List'
4. Click on the tab that says 'Manage DNSSEC'
5. Choose 'Enable DNSSEC'
6. Enter in the DS record from the CloudFlare dashboard and click 'Save'