Log in to your account
Click on My Account
Click the Domains tab
Check the box next to the domain you would like to update
Click on the Manage Domains drop down menu
Click Domain Hosts
Add your hostname, such as ns1 and ns2 (without a period at the end) and the corresponding IP address
Click the grey Add Host Nameserver button, after each entry
After you are done adding all your entries
Click the green Submit Changes button at the top of the menu
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