In the App list, go to “Settings”.
Turn on the VPN status.
Click the “plus” button to create a new vpn profile.
In Server name field put the boxpn L2TP server address. ( all server list you can find here.)
In Type field choose: “L2TP with IPSec”
Click on Connect using and choose: user name+password+preshared key.
Input the following Preshared Key in appropriate field: s3CuREpaSs412
Set Connect automatically to: On
Change Send all traffic status to: On
Tap on created profile to connect to VPN.
When VPN connection is established Status shows Connected.
And you should be able to see a padlock right above your wireless connection icon.
This means that your internet connection is encrypted.