How do you restart 2003 kitac juggler girl slot machine?

It is the same procedure used for setting the payout odds. Here is the procedure from the manual:

Game odds are adj to 6 different levels. Odds will differ with each machine. To change the odds (or reset) there will be a key switch or toggle switch. Turn the machine off and turn the ODDS/RESET KEY SW or toggle to the "ON" position. Then turn the machine back on.

Number 1-6 will be shown on the credit meter (or display on the back of the front door of the machine, depending on the mfg). Use reset button on the power supply or small button on back of the door to change the odds to the desired setting. When the desired setting is reached, press down on the "SPIN REELS/(PLAY HANDLE)" lever to set the odds.

Turn the KEY SWITCH or toggle to the off position and the machine will be ready to play!