To park your domain (also known as domain parking), 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 page, select the "Dynadot Parking" from the top drop-down menu.
6. Press the "Park Domain" button to save your changes.

Please be aware that it might take some time for your name server changes to propagate.