Congrats on losing 31 pounds!!!
Those are trophies that you can award yourself. Go to your SparkPage and click the "Awards" tab at the top. Under the right side column called "My Trophies," click the "Manage My Trophies" link at the bottom. At the top of the next page, click the button that says "Add Weight Lost & Event Trophies" (that is just to the right of the gold trophy cup with the SP emblem on it). There, you can select your weight loss or SparkVersary trophy each time you reach a new milestone.
Let me know if you have any trouble following my directions.