Follow the next instruction to start using VPN service and protect you privacy when surfing the internet on iPhone/iPad.
1/ Register an account. This step is optional, but recommended if you want to also use your subscription with a Mac or another devices(iPhone, iPad, Mac, Android, Kindle, Windows 7+). For more information take a look at the How To Register An Account on iPhone/iPad help article.
2/ Purchase subscription. For first time you can get 1 free day of subscription to evaluate the service. After that you can select one of subscription plan from the list for your needs. Step 2: How To Purchase Subscription on iPhone/iPad
3/ Switch VPN connection status ON in the left side of the screen. Immediately, you will see the notification about the necessity of adding VPN configuration. Tap on "Allow" button, wait for a few seconds, the VPN profile will be installed automatically and VPN connection will be established. Please, note that VPN profile installation is required only during the first start of VPN Shield after Sign In.
For devices with iOS 7 - you need to configure VPN Profile firstly. Find the instruction here How To Setup Configuration Profile On iPhone/iPad Start using our VPN service. For more information take a look at How To Connect VPN on iPhone/iPad with iOS 7 help article.