Theis filtered with the Network (Router) settings by default. In order for the to be managed separately, you will need to follow the steps below.
Step 1: Click on the iPod Touch icon.
Step 2: Click on the Info Tab in the bottom section of the Management Console.
Step 4: Click the Update button to apply your changes.
You will now be able to configure filtering at the device level for your iPod Touch using thesettings.