Please follow the instruction below:
Go to Menu: Android/ Settings: Wireless and Networks.
Go to Wi-Fi settings and enable the W-fi
Select your Network from the list and type your security Key (you need to click on the password tab in order for the virtual keyboard to appear)
Please note:
If you have a hidden network you can add it by going to “Add Wi-Fi network” and enter the Network SSID and the security Key