You will need to share your personalized referral link which you can find by logging into your account and clicking the Rewards page. Click Start Referring Now then you can either enter your friend's email address or press Copy Link to copy your referral link.
In this link, your friend will receive a code for 10% off on their first one-time order of $50+. Once their order has shipped, you will receive your 1,000 referral points. It can take a few days for the points to show up on your account. Get started with Refer-A-Friend here.