Samsung Galaxy S4: How to Use VPN in Android 5.0.1 Lollipop

In Samsung Galaxy S4, you're allowed to add VPNs (Virtual Private Networks) and connect to one of them. You'll have some benefits when using VPN, e.g: you can access your business or home network over Internet with more securely anywhere you are, you can have private browsing even when you're in the public network, you can access country-blocked websites by connecting to a VPN located in another