To sell your shares with a broker, you need to change your shares from ‘Issuer sponsored’ (that is, the company holds the shares in your name under a SRN) to ‘broker sponsored’ (that is, the broker holds the shares in your name under a HIN).
By providing a broker with your SRN, as well as contact and other details, the broker will set up an account for you, create a unique HIN and then register those shares in your name with your HIN.
At all times the shares remain registered in your name, whether they be issuer sponsored (via a SRN) or broker sponsored (via a HIN).
Online brokers that set up accounts quickly and efficiently include:
e: brokingservice@cmcmarkets.com.au
p: 1300 360 071
p: 13 13 80
p: 1300 769 433