Questions about my new singer xl420

[Hulamoon]

My confusion comes with bobbins.my Viking will only take the 'green'bobbins and the letter V has to be facing forwaard. With my babylock when you use a prewound you have to put in a special washer that has a nailpolish red mark on it. i had to call the store twice to ask what color to use. lol

Such a nice gift. Hubby said get a new serger when we refied. Love new toys!