First, head over to https://app.datatrics.com/channel and search for MailCamp.
Click on the green "Integrate" button and you will be redirected to the settings screen.
Fill in the URL for example http://www.yourdomain.com/mailcamp/xml.php.
Fill in the username and token, you can find these in Your MailCamp management under the title 'XML Gebruikersnaam' en 'XML token'.
After saving the channel settings, Datatrics wil synchronize all your contact data.