You will see the option to select the delivery method for Click and Collect in Store on the Delivery Page after you have entered a valid Australian address and selected continue. You will need to enter this before you can proceed to the Click and Collect page. Once you hit continue, the next page will give you the option to choose a Click and Collect store convenient for you.
This will be right under the Standard Delivery option (Highlighted below):
Simply search for your nearest store using the suburb on postcode and then simply select the store and click 'Continue'.