No... it is also for computers - but your question had been categorized under mobile devices. There is a windows version here:
It's not actually asking to take a picture of your iPad. It's ask you do the following:
Download the we chat app from the Apple Store to your iPad
Run the we chat app on your iPad.
After the we chat app is installed and running on your iPad – go to the settings menu and then select the option to scan
Only then should you follow those instructions and point the camera at the box of black and white rectangles – called QR code and scan it into the app. There is in exact picture of what they mean when you hover over the app on that page. You have a screenshot of precisely where that option is in the app. It's in the screenshot you sent to me. Look at the phone on that screenshot and it will show you where the setting is to scan the code.