Activating financial image means selecting the elements of the form that is relevant. Image are activated according to your ATO prefill (ie PAYG, Interest, Dividends) and whatever rolled forward from previous year (ie Rentals, work related expenses, ect)
Chose the form that you need to work on.
Click the 4 little squares located at the right side of the form.
Then activate the icon that you need for your form, and click "Save".