First, log into your Blitsy account. You will see your Reward points available in at the top right.
When you click into your cart, click on 'Apply Points' in the bottom right-hand corner. This will bring up a blue points slider.
Click and then drag this slider bar to the number of points you wish to use on this order.
Click 'Apply Points'.
Lastly, click 'Checkout'.
For more info about Blitsy points and how to earn them, click here.