Its like Rocket Science..SERIOUSLY!!!

[rebeccas-sewing]

Since you have a computerized machine just move the needle 1/4" away from the edge of the presser foot. Line up the edge of your fabric with the edge of the presser foot as you sew. As you are sewing keep your eye on the edge of the fabric to make sure it lines up with the edge of the foot.

I agree with Mia. Consistency is the most important thing. If you sew every seam the same throughout the quilt, everything should fit together nicely. That 1/4" foot should help you stay consistent since you're running the edge of the fabric along the guide on the side of the foot.