As AVJennings’ shares are listed on the ASX you need to contact a stockbroker to buy and sell AVJennings’ shares. If you do not have a stockbroker you may refer to the brokers listed on the ASX website.
Trading in AVJennings shares on the SGX can be done through your stockbroker. Alternatively, you can also open a trading account with an SGX broking firm if you do not have an existing trading account.