Under Criteria:
Go to Asset Class - open by pressing the + button - click onto Equity box
Go to Geography - open by pressing the + button - now press the + button in Asia Pacific to open it up - click onto the Australia box
This should bring up a bit over 100 Matches to the right of the criteria area - Scroll through to find the Australian Indices needed.
Hover over the Index wanted such as ASX 200 and select Factsheet - this will bring up a PDF about ASX 200 going back about 9 years
Clear clear criteria and do much the same for your S&P500
If you want longer data for the Australian market you can also use marketindex.com.au but I'm pretty sure it doesn't have ASX 300 A-Reit or S&P500