You adjust the bottom bobbin tension by tightening or loosening the small screw that holds the front of the spring steel tension to the bobbin case. In the two pictures, the front screw is not there, but that's the screw that adjusts the lower tension.
The thread goes through the needle from left to right. The groove on the needle faces to the left. The scarf on the needle faces to the right. The scarf is the half moon shaped cut out just above the eye on the needle where the hook picks up the bobbin thread. Make sure you are running the thread through the thread guide just above the needle.
You adjust the foot's pressure with the wing nut on the back of the machine and the knob on top of the machine. In general, you want the pressure to be as light as it can be unless you are sewing really light fabric.
No one lives forever, the trick is creating something that will.
Last edited by DanTwoLakes; 09-21-2010 at 08:58 AM.