Go to domain.com and click on the Account Login and log into your account.

Click Domains:
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Click on the gear icon for your domain name:

Click DNS, & Nameservers:
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Click DNS records:
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On the row that contains the @ symbol, click the edit menu:
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Edit the Host that contains your domain name and enter this IP Address in the Points TO field: 52.87.130.147
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Select Pointers & Subdomains
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Click Add Subdomain:

Enter www into the Host field and add your domain to the Points To field and click Save: