1. Go to Settings in your iPhone or iPad.
2. Scroll down and find the VPN option.
3. Tap on Add VPN Configuration...
4. Fill the options like the below screenshot, In this screenshot we tried to connect United Kingdom S1 server, So we filled as below, after you done, tapn on Done.
5. The VPN connection has been created like the below screenshot.
6. Tap on radio icon to VPN get connected .