If you want to integrate Google AdSense adds with your DotNetNuke site here is how I did it:

First you need to login as Admin and add new HTML module to the page using Modules menu on the top of the page.

Move mouse over Manage button on the top left side of added module and from the menu select Edit content.

For the editor select Basic Text Box and for the Render mode select Raw.

Copy and paste Google AdSense generated code into editor and save module.

After that you need to select invisible container for your module, so you don't have any border or header displayed around Google adds.

To do this move mouse over Manage button on the module, and select Settings from the menu. On the Page Setting tab uncheck Display Container option or select Module Container which does not display any border or header arround content. In standard DarkKnight DNN theme this module container is: Host: DarkKnigth-Invisible