So, how does this actually work?
As per their https://www.coolwinks.com/coolcash-refer-and-earn/
When they register at Coolwinks.com using your referral code, you earn Rs. 500 CoolCash.
Use this Coolcash to enjoy discount on your shopping at Coolwinks.com.

https://www.coolwinks.com/coolcash/
What is CoolCash?
CoolCash is Coolwinks virtual money which you can use to buy anything from Coolwinks.com
CoolCash cannot be transferred to your bank account. It will remain in your CoolCash account and can only be used on your Coolwinks purchase.
CoolCash earned in one account cannot be transferred to another account.
There are two ways of earning CoolCash amount.Through Refer & Earn and Participating in Promotional Campaigns.

So it seems your:
"Best way to earn money online no work no time instant money only have to sign up ..."
doesn´t apply here, isn´t it?