MX records can be edited through the MX entry of your cPanel Please see the following on this.
<a href=""http://www.inmotionhosting.com/support/edu/cpanel/cpanel-email/modfying-mx-records">Modifying your MX records</a>
As for the TXT record. The TXT record requires access to the <a href="http://www.inmotionhosting.com/support/edu/cpanel/cpanel-manage-domains/advanced-dns-editor-cpanel">Advanced DNS editor</a>. On shared servers, you will need <a href="http://www.inmotionhosting.com/support/website/website-troubleshooting/how-to-get-great-technical-support">tech support</a> to add the record.
If you are on a VPS or a Dedicated server, If the <a href="http://www.inmotionhosting.com/support/edu/whm/306-configuring-advanced-dns">Advanced DNS Zone Editor is enabled</a>, you can edit it through your cPanel.
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