It's pretty simple. 1: go to iTunes 2:plug in I device 3:on the left there are little tabs, click on the Apps tab 4: click,hold,and drag app icon to you're I device name. Or (first do steps 1-2?) 1:click on you're I device name( double click it to name it) 2:click(at the top) on the apps tab 3: on the left side you click on the app you want icon and drag it to you're iPod on the right 4: click sync on the bottom right. 5:wait until at the very top it doesn't have the sync or Lodi g bar at the top and remove I device.
Go to Settings > Store. Under the category Automatic Downloads, make sure that Apps is so set to on. Then check that your iPhone is plugged in to a power source and connected to Wi-Fi, go to Settings > General, and select iTunes Wi-Fi Sync. Click on the Sync Now button.