To download an app:
- On the homescreen, tap App Store
- To browse for an app, tap Categories
- Tap on the app you want to download. If you've chosen an app that you need to pay for, tap the Price. If you've chosen a free app, tap Free and then Install
- You'll be asked to sign in using your Apple ID. Enter your email address and password, tap OK
Once you've signed in, the app will start to download automatically and a progress bar will show you how far it's got.