Ah - this little gem. So everytime you shop - you automatically earn points. Every dollar spent on merchandise (sales tax and shipping not included) = 1 point. The points can then be transferred into store credit and used towards your purchase.
The points can only be transferred at once and the credit will automatically be deducted when you next check out.
The more points you save up the better point to dollar transfer rate you get so it pays to save up. The points don’t expire and don’t have a limit to how many you can collect before you transfer them.