Hello Linda,
That is either a threading problem or tension problem,
make sure you have the presser foot up when you thread the machine so the thread goes completely between the tension discs, toip tension about 5, make sure you can only just pull the bottom tyhread through with some slight resistence, if it is tight turn the screw on the bobbin case anti-clockwise to loosen the thread but only turn it about a quarter of a turn at a time.
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