Install All iDevices WhatsApp Sync in iTunes

Hello everyone, I made this little tutorial for those who are sick of WhatsApp delete the application every time they have to sync in iTunes for example, as happened to me with the 4G iPod Touch. Well I leave you without the tutorial steps to your iDevice saincronizar seamlessly with iTunes.
Requirements: Have iPhone, iPod Touch iPhone with firmware 4.0 onwards
Have Jailbreak
Knowing how to