To forward your domain using Dynadot DNS, please follow these steps:

1. Sign in to your Dynadot account.
2. Select "My Domains" on the left-side menu bar and click "Manage Domains" in the drop-down.
3. Check the box next to the domain name(s) you want to forward 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 drop-down menu.
6. In the "Domain Record" section, select "Forward" from the drop-down menu, choose forward status type from the "Select" dropdown, and then enter the URL you wish to forward to under the "IP Address / Destination" box.
7. In the "Subdomain Records (optional)" section, enter the host name like "www" as the subdomain, and repeat Step 6.
8. Press the "Save Settings" button to save your changes.

Please be aware it may take some time for your changes to propagate.

Check how the Advanced Options work