There are two types of Draws, the Competitor Draw and the Stock Draw.  The Competitor Draw must run first. Tap the Draws icon then Tap the Generate Draws button. Tap the Competitor Draw button.  If a draw has already been ran, you will asked to confirm if you wish to Re-Draw. The Competitor Draw will run the draw for all events in the Competition.

Next tap Generate Draws again and tap Stock Draw.  This will assign stock from the stock you made available previously to the Competitors in events which are marked as Assign Stock.