Download free apps from the Google Play store by clicking on the green Install icon on the application's page. In order to download any content using the Google Play service, you must first have a Google account registered on your device and have a data connection, as well.
If you do not already have a Google account, you must register for one and add it to your device before you can download apps. Make sure you are connected to the Internet or have a data connection on your phone before you start. Open the Google Play app or go to play.google.com on your computer, and select the app you would like to download. You can search for free apps by keyword or browse all free apps available by category. Click on the Install icon and follow any instructions when prompted.
Some apps on the Google Play store are designed for use only with supported Android devices, so they can't be used on your computer; however, you can still use your computer to download apps to your device, as long as your Google account is loaded. The app is downloaded to your device shortly after selecting it, as long as it is compatible.