For A and AAAA pairing, please follow these steps:

1. Sign in to your Dynadot account.
2. Select "My Domains" from the left-side menu bar and click "Manage Domains" in the drop-down.
3. Check the box next to your domain name(s) and click on the "Action" button.
4. Choose "DNS Settings" from the "Action" list.
5. On the DNS Settings page, select "Dynadot DNS" from the top drop-down menu.
6. In the "Domain Record (required)" section, select AAAA from the drop-down menu and then enter your IP address in the "IP Address or Target Host" box.
7. Press the "Save DNS" button to save your changes.

The screen will refresh and there will be a new field for your A record. You can select either A or AAAA for any subdomains you wish to input as well.