Click the "iPod Touch" device under Devices in the iTunes sidebar.
Scroll down on the iPod Touch page and click the "Manually Manage Music and Videos" checkbox under Options.
Click the "Apply" button at the bottom right corner of the iTunes window.
Apple sets the iPod Touch to automatic mode by default. In automatic mode, iTunes automatically adds new content to your iPod, and removes content deleted in iTunes whenever you connect it to your computer. You can also manually manage your iPod Touch, which is useful if you have more iTunes content than can fit on your device. In manual mode, you can add specific files to your iPod and delete files on your iPod from iTunes. Manual mode is necessary if you want to use your iPod with different iTunes libraries on different computers.
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