Launch the Settings application, tap General, then tap Network, and then tap VPN
Tap Add VPN Configuration…
Tap L2TP and enter your VPN informations (get it from your VPN provider account) . Description: My VPN (or other name) . Server: Enter the VPN server address (get it from your VPN provider account) . Account: Your VPN account Login . Password: Your VPN account Password . Secret: thisisourkey