I recently had installed the app instagram onto my iPod touch 4G. I let my cousins play with it then I went back onto my iPod and the instagram icon wasn't there anymore. I had went to the settings , then clicked on general. I went to usage and scrolled until I found the instagram app. I deleted it. After I went to the App Store to reinstall it. Usually where it says install instead there was a gray shaded box the said free. I tried to click on it but nothing happened. I restarted my iPod,went back to the App Store and it still didn't work. I also have iOS 6.2
Please help ASAP
