How do you turn the hand wheel?
Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center. Always be sure your presser foot is in the DOWN position before sewing.
Which part of the sewing machine holds the needle in place?
Needle Clamp (or Needle Bar).
This is what holds the needle straight and steady in the sewing machine.
How do you open a jammed sewing machine?
Raise the needle to the highest position using the hand wheel. If the needle will not move, gently work the hand wheel back and forth a little bit to see if the needle loosens.