From the Contracts Table, if you are connected to MyTrack, press the Trades button.
This opens the Stock Trades window. Here you choose an account, and perform trades.
To select an account:
Use Test Account until you are familiar with the program. Once you use Real Account, you then enter actual trades for which you are financially responsible.
If you have more than one account with MyTrack, you will then see a list of the accounts, and can choose one.