Click on the domain you want to use with Unbounce.
Click the DNS Zone File tab.
Scroll down to the CNAME (alias) section and click Quick Add.
Complete the following fields:
Enter an Alias Name — For the Alias Name, enter only the subdomain of the address you want to use for your Unbounce custom Domain. For example, if you picked you're using a root domain such as www.mydomain.com then you'll want to enter www here. If you're using a custom subdomain such as try.mysite.com, enter try here.
Points to Host Name — Enter unbouncepages.com here.
TTL — Select how long the server should cache the information.
Click Save Zone File, then click OK to confirm the changes. The new CNAME record displays in the CNAME (Alias) section.
How to create a 301 redirect in your GoDaddy hosted account:
If you want your visitors to access your landing pages without needing to type the 'www' in front, you need to configure a redirect to push them from 'yourdomain.com' to 'www.yourdomain.com' instead.
To do this in GoDaddy:
Log in to your Account Manager and click the green Launch button next to Domains to access your domain list
On the next page, put a checkmark next to the domain you would like to forward
With the domain you would like to forward selected, click the green Forward icon in the toolbar then click Forward Domain. This will open the Forwarding and Masking dialog.
In this dialog, configure the redirect to forward visitors from MYDOMAIN.COM to http://www.mydomain.com instead
Click OK and wait for the changes to go through.
That's it! Now visitors who access yourdomain.com will be redirected to www.yourdomain.com instead.
Zone File Error
If there are any errors when you try to save your zone file, GoDaddy will show a message explaining the errors. You'll usually see this if you're trying to create a CNAME record for a sub-domain (host) that already has an existing A Record. More often than not, it's when you try to create a CNAME record for your "www" subdomain.
To fix this up, delete the A Record for your "www" subdomain then create the CNAME record as outlined above.