Bill,
First off, don't zap the records on the turntable, do it somewhere else.
Here is the instructions on the back of the box:
Hold Zerostat about 12" from record. Squeeze the trigger slowly (a powerful stream of positive ions projects over a spread of about 16"). Release the trigger slowly and negative ions are produced.
So basically squeeze slowly, then release slowly over the record.
Oh, If there is a little cap on the front nozzle, remove it when you do the zapping. To test if it works, put the nozzel on your arm and squeeze the trigger, you should feel a zap. You can also do it to a copper waterpipe in a darkened room, you should see a spark.
Wayner