* Go to Linode DNS Manager and press "Add a domain zone". Put your domain there.
* Add desired records in such zone.
* Verify that they work by querying Linode's DNS servers. For example, if your domain is "example.com" and you added a MX record in the zone for "example.com", you can check with this command:
Code:
host -t mx example.com ns1.linode.com
* Then, and only then, you can tell your DNS register that your DNS servers will be ns1.linode.com and ns2.linode.com. From that point on (or more accurately, after a while which may be as long as 48 hours), the DNS records that will be valid for your domain will be those defined in Linode's DNS Manager, and only those. This is why the records should be checked carefully before making the "switch".