You'll see the modal window, press Allow to start importing VPN profile.
Go through profile installation proccess by tapping Install, then enter your passcode and confirm, that you're want to enable our VPN on your device
Now, when your VPN profile is installed you may enable VPN connection. To do so, go to Settings → General → VPN. If you prefer VPN connection to be enabled all the time, go to details and enable On Demand option. Enjoy your secure and anonymous VPN connection.