Taking a screenshot on your iOS devices (iPod Touch, iPhone, iPad) can be easily accomplished by just holding a couple of buttons at the same time.
These instructions below works for all versions iPod Touch, iPhone and iPad versions.
First of all, navigate to the menu you wish to take the screenshot. This could be the homescreen, the settings screen, or the VPN App screen.
On your iOS device, please use the combination as below:
Press and Hold the Sleep/Wake button and the Home button at the same time
If done correctly, you will see a brief white flash followed by a camera shutter sound on your device.
The screenshots will now be in your Photos.