How do i put threed into the bobbin and keep it from not getting tangled?

Is it getting tangled while you're spooling the bobbin on the top right corner of the Singer 1507 machine? If this is the case, you have to pull the thread through the top tiny hole in the bobbin, and hold on to the thread end. Then click the bobbin to the right to lock it in place, power up your machine. Keep holding the thread as you begin spooling the bobbin. Let go of the thread once the bobbin starts to spin a few rounds and the thread should not get tangled.