In your blogspot account, I think you need to add the domain name you're using (include www or whatever subdomain you choose). In your Dynadot account, you would select the Advanced Dynadot DNS setting and create a CNAME record for the subdomain and point it to the blogspot target host. The target host would probably be "ghs.google.com".
How do I set up DNS for my domain?
Before adding DNS records, determine which name servers your domain is using:
If your domain uses third-party name servers: Contact your hosting provider to add DNS records, as all DNS configurations are managed directly on the designated name servers.
If your domain uses Dynadot DNS: Your domain is automatically using our name servers, so manual name server configuration is not required. You can add DNS records directly through the Dynadot DNS page by following these steps:
Select "My Domains" from the left-side menu bar and click "Manage Domains" in the drop-down.
Check the box next to your domain name(s) and click on the "Action" button.
Choose "DNS Settings" from the "Action" list.
On the DNS Settings page, select the "Dynadot DNS" setting from the top drop-down menu.
Choose the "Record Type" you want to use from the drop-down menu, then enter the IP Address or Target Host of your web server in the text box.
Domain Record (optional) - If you have been instructed to add an "@", this simply means that the record should be entered under the "Domain Record (optional)" section. Do not enter the "@" symbol itself.Supported record types:
Subdomain Records (optional) - Subdomains are prefixes added to your domain name. For example www.mydomain.com or blog.mydomain.com, specify the subdomain name (www) or (blog) then enter the target server or IP address.Supported subdomain record types:
If you have an Email Server or MX Record available for your domain email, enter the priority (otherwise known as distance) and the hostname in the subsequent text boxes.
Press the "Save Settings" button to save your changes.
Please be aware that it might take some timefor your name server changes to propagate.
Note: If your domain is configured with Dynadot Email Setting, please disable the email settings first. Once disabled, you can proceed with resetting your DNS records.
Our Advanced Dynadot DNS also requires an IP address for just the domain. You can use 127.0.0.1 as the IP address for just the domain, which would point a visitor back to their own computer.
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