Singer Heavy Duty 4423 Serger How To Vidoes

Just got this singer heavy duty 4423 but when I test it out the top thread keeps getting tangled on the bottom and it ends up looking like this. Please help, I'm

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SINGER® Heavy Duty 4423 Sewing Machine with 97 Stitch Applications: Perfect for Sewing All Types of Fabrics with Ease, Even Leather!

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