How do I change name servers at Register.com
Go to www.register.com.
Click "My Account" in the dark blue tool bar near the top of the page.
Enter your login information.
If you've forgotten your login information, click "Forgot your user name or password?" to retrieve it.
Enter the domain name you want to change. Click "Domain Name server" (DNS).
At "Modify DNS": Click "delete for the current name servers.” Enter the DNS information.
If you see the "Would you like to make these changes?” prompt, click "Yes."
When you see the "you sure you want to make these changes?" prompt, click "Yes."
A confirmation email is sent to your mailbox. Confirm the changes through the email.
Tips & Warnings
* Once you're done, the DNS changes will take effect within 24-72 hours. As with any domain registrar, it may take up to 72 hours for Nameserver to update globally