The first thing you need to do, when threading a sewing machine, is make sure you have a bobbin that matches your top thread. If you don’t already have one, you will have to wind one. Here’s how to wind a bobbin.
Place the bobbin spool firmly onto the bobbin winder pin. Keep holding that thread. Push the bobbin winder pin to the right, firmly. You should hear a small click when it is in place. This should stop the needle from moving when you give it power and engage the bobbin winder.
Continue holding that thread. Press down on the foot pedal to give your machine power. This should wind the bobbin. After it goes around enough to hold the thread on its own, you can finally let go of that thread. Run the machine until you have the desired amount of thread on your bobbin or winding will automatically stop when the bobbin is full.
Now, you are ready to thread your sewing machine.