The answer
Open the domain and its DNS section in your account. These records affect public resolution when your domain uses our default nameservers. With custom nameservers, edit the zone where those nameservers are managed.
Copy the type, name, value and any priority from your service’s instructions. Use @ for the root domain. Only remove existing records when you understand their purpose.
What to do
Select the domain and open the DNS tab.
Choose the record type and complete all required fields.
Save and check the new record.
Test the website or service again after existing DNS caches expire.