DNS zone changes have to be made on the platform where your domain is currently pointing by nameservers. If you are using hPanel, here's a few articles on managing MX and TXT records:

In case you are pointing your domain to a different provider by nameservers you can check this article for managing DNS Records on various providers

NOTE:

  • Any DNS Record changes trigger propagation, which can last up to 24 hours to fully propagate.

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