You can use your user account credit for shopping on Netflea.com.
If you want to use your user account credit for purchases, you will have to be logged in. At checkout, there is a check box 'Pay with user account credit'. Click the box, and your credit is used to pay for the products in your cart.
Please note that credits cannot be used for payment if you are using a discount code. Unfortunately concurrent use of credit and discount code is currently a technical limitation of the service.