How to Sync an App to an iPod
- 1). Connect your iPod to your computer and open iTunes if it does not automatically start once the iPod is connected. Wait for iTunes to recognize your iPod and display its icon in the left-hand column of the program window.
- 2). Click on your iPod's icon, then click on the "Apps" tab in the menu that appears in the main program window.
- 3). Click to place a check mark in the box next to "Sync apps," then click to place check marks in the boxes next to the icons for any apps you want to sync to your iPod.
- 4). Click the "Sync" button and wait for the syncing process to complete.
Source...