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It will begin wiggling. After around a second, a grey cube will appear around the bottom app. This will drop your top app into a folder with the bottom app. The folder name is above the grey area in which your apps are seated; tapping X will remove the title of the folder and allow you to add your own. If your iPod's keyboard doesn't appear, first tap the folder name bar. It's the blue key in the bottom-right corner of your keyboard. This will minimize the app folder. Doing so will add them to your folder. You can also tap and drag the folder to move it in the same way you'd move an app. This will cause your apps to stop wiggling.
Tap and hold an app. Drag the app onto another app. Remove your finger. Tap X to the right of the folder name. Type in your preferred folder name. Tap Done. Tap outside of the app folder. Tap and drag apps into the folder. Press the Home button.