If ever i need to buy where should our token be keep?
And also it is needed kyc upon purchasing?
After your transaction completed. Your purchased ERN token will be sent directly to your ETH address. The ETH address that you used in sending payment. Your ETH cashback as well, it will be automatically send to your ETH address. In ERN, you can start enjoying your earning even before the ICO ends. No need of KYC in purchasing in the PRE-ICO sale..KYC was only needed during the exclusive private sale and private sale.
Purchasing ERN token was easier than other ICO's, and the Ethereum cash back is superb. And about your statement, " can start enjoying and earning even before ICO ends" does it mean that they'll distribute the purchased ERN token while the ICO is still ongoing? The no kyc in the Pre-ICO is a good idea though.