To start configuring your domain settings using Yahoo ! Small Business, log in to your account and access the Domain Control Panel.
Click on the Manage Advanced DNS Settings
How to configure your sub domain DNS
Click on the sub domain you want to edit. If a sub domain does not exist, you can create a new one by clicking the "Add Record" button.
Enter the "Destination" as yourstorename.highwire.comand click the submit button.
Go back to the Advanced DNS Settings and click on the "Edit" link for the root domain. In the "Destination" box, enter the IP address 126.96.36.199 and click the submit button.
How to add a custom domain to Highwire
To add your custom domain, log in to your dashboard and go to Settings>Domain Hosting. If you have an existing domain, click the button ‘Add Existing Domain’. If you have not registered a custom domain but would like to register one, this can be done by clicking the button ‘Register New Domain’.