A Dividend Reinvestment Plan (DRP) instructs a company or share registry to reinvest any dividends paid to, the shareholder, as new shares.
If you wish to participate in DRP you will need to contact the share registry that manages your stocks and register for DRP participation.
To find the share registry for a particular company go to:
www.asx.com.au > Markets > Prices and Research > Company Directory > ASX website > www.asx.com.au > Markets > Prices and research > Company Directory> enter stock code in Search for a company by code or name bar > select the company, once the page has been returned, scroll to the bottom of the page.