Manual Setup for IOS 9 (L2TP)
1 - On your iOS device, tap Settings > General > VPN (scroll down) > Add VPN configuration
2 - Use the following settings on VPN configuration page:

Type: L2TP
Description: [make up a name for your connection]
Server: [choose a server address from this page, (Ex: us.bettervpn.com) ]
Account: [your BetterVPN username]
Password: [your BetterVPN password]
Secret: b15n2112ep

then tap Done.
3 - You’re ready to connect to the VPN now! Tap the VPN button at the top right.
Awesome! Your VPN connection is now up and running.