Email Authentication help to add an entry to my DNS server - Google Apps

Hi guys, I am registering on Cakemail and it wants my Email authentication

Here is what it wants:

In order to confirm that the sender is the same as the domain owner, you must authenticate the email address you want the campaigns to come from. The following steps will guide you through the process.

This email must use a domain you own.

Here are the configuration instructions for sending emails from yourdomain.com.

SenderID/SPF

To help maximize delivery, you should authenticate the 'From' domain you will be using to send your emails. This is done by adding the following entries to your DNS server:

Marketing Email

ID Projekti: #5311658

Rreth projektit