Bobbin won't wind/fill. Post does not spin - Juki TL-98Q

Firstly, have you checked the manual?
if you don't have one go here
http://www.jukihome.com/downloads/manuals/TL98Q_InstructionManual%28ESF%29.pdf

you need to look at page 12/13.
once you have placed the bobbin onto the spool holder (the short metal pin) thread the yarn around the bobbin, then push the long curved bar up against the bobbin where the thread will be wound. If the bobbin is not fitted on the pin correctly and the curved bar won't fit into the slot. The movement of the curved bar disengages the needle and wind the bobbin, the curved arm will move as the bobbin fills and automatically stop.
i hope this helps

• You push the bobbin to the right and the machine should start winding.
• When the bobbin is full, the stop, against which the thread bears when the bobbin is full, pushes the bobbin to the left and stops the motor.

Pop an empty bobbin on the thread spool. You need to disengage the motor from the presser foot so that the motor no longer makes the presser foot go up and down, but sends the power to wind a bobbin on the thread spool. Check with your machine's manual, but this is usually done be either pushing in, or popping out a button on the hand wheel. Begin a new thread on the bobbin following the directions either from your manual or as printed on the machine. On my Bernina, I have to push the thread spindle sideways to engage the bobbin winder. Use your foot pedal now and the bobbin will automatically fill up. It should stop when full, then you reverse your actions. eg: push the thread spool back, pop in the button on your hand wheel, insert the bobbin (check with your user manual as to clockwise-anticlockwise, and yes it DOES make a difference!) Re-thread your machine (always with the presser foot up) and make a test stich.
I hope this helps and happy sewing.