This video shows a demonstration of how to machine sew the binding of the quilt, especially the tricky corners. She starts with the binding already sewn onto the front of the quilt and points out how she made the corner like a little pocket. As she sews along the side and approaches the corner, she folds up the binding on the edge that's past the corner and pins it, so it keeps the corner in shape. Then she folds that entire edge up all the way to the corner, holds the corner down tightly with her fingernail, and folds the other edge over. She holds the pin in place while she continues sewing up to the corner. Following these steps will help you make your quilt corners nice and neat.
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