Wi-Fi
Drag the button on the Wi-Fi switch 
to the right to turn on Wi-Fi
functionality to connect to available Wi-Fi networks. Drag it to the
left to turn it off.
Wi-Fi settings
Turn Wi-Fi on, then tap Wi-Fi to access the following settings:
Notify me: Checkmark to be notified when a Wi-Fi network is in range when you launch an application.
Optimize Wi-Fi usage: Opens a dialog box to optimize Wi-Fi usage when launching applications or uploading/downloading large files.
WI-FI NETWORKS
The list of all of the Wi-Fi networks that are within access range. Tap one to access it.
NOTE
Tap the Search button at the bottom left of the screen to scan for available Wi-Fi networks. Tap the Add Network button at the bottom right of the screen to add a new network.