Here are the steps involved in restoring chat message of your whatsApp message. Steps involved are very simple and believed will help you . The mentioned steps are very easy to understand.
Go to iphone Settings > iCloud > Documents & Data > On. You need to turn this on to save WhatsApp conversations.
Open WhatsApp, tap the Settings button at the bottom-right. Select Chat Settings > Chat Backup > Back Up Now.
In the same place, you'll see an option called Auto Backup. Tap it. By default, this is set to Weekly. We suggest that you change this to Daily to avoid data loss.
To restore backups, uninstall the app and reinstall it. Select Restore after verifying your phone number.