It means if you have an Adsense account, you can participate in revenue sharing after meeting the requirements. "pub-xxxxxxxxxxxxxxxx" is nothing but your adsense ID. Most members set up a special channel ID their Adsense control panel to keep up with DP earnings.
For more information about the Revenue Sharing program you can click the link under the ad that says "This is an ad revenue sharing forum" That should answer any further questions you might have.