I agree with all of the previous posts.
1. Your backing wasn't stretched taut to begin with and starching it will help control puckers and slide through the machine easier.
2. Spray baste or use pins to tack more closely than you did.
3. Loosen the pressure on your presser foot.
4. Increase your stitch length. Quilting is quite a bit bigger stitches than sewing
5. Practice on a scrap before loading the real deal but preferably a scrap made of the same stuff as the real deal.