This demo assumes you have a domain name registered through 123-reg.co.uk, and starts from the 123-reg.co.uk home page
Now let's learn how to update your domain name's DNS (Domain Name Server) settings
1) Click on the Log in to your control panel link here

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2) Enter your 123-reg.co.uk account Username and Password in the boxes here

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3) Then click OK
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You are now logged in to your 123-reg.co.uk account
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4) Click Manage
 
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5) Click the Change Nameservers link

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6) Enter your new domain name DNS settings in the boxes here

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You only have to enter two nameservers (Primary and Secondary); Nameservers 3 and 4 are optional
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7) Click the Change Nameservers button
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That's it! The new DNS settings have been submitted

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Remember that it can take 24-48 hours for your domain name to fully propagate, after you make these DNS changes
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This is the end of the tutorial. You now know how to update the DNS settings of your domain name, provided it's registered with 123-reg.co.uk