Before whatsapp refrain this option only to Android, Windows and Blackberry. Due to Apple's limitation it wasn't possible to integrate iPhone users with the web version of the world's largest messaging platform. However, now it's available and iPhone users already have the feature to sync with the web.
To access whatsapp web follows below instruction:
1. Go to web.whatsapp.com
2. Scan QR code
And it will start pairing.
