you hold your finger on them and then click the cross that will be next to them
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Press the Home button.
Keep pressing it until it starts shaking then a cross should appear in all the apps and if you press the cross it asks you if you want to delete.
Your iPod will not delete apps on its own. You must delete the apps yourself.
you dont
Click on the IPod symbol, when you plug it in, on itunes. Up top go to "Apps" and select "Sync Apps" off to not sync them :)