Search using this live search box. You will be taken straight to Google Scholar search results in a new window.
When you search Google Scholar from the University of Melbourne you should see the Source It@Melbourne link to the right of each item in the results list.
If you find that you do not see the Sourceit@Melbourne option you can update your settings by clicking on Scholar Preferences next to the Search button and add University of Melbourne to your 'Library Links' in the next screen, you may need to do this from a campus computer. Once you save your preferences while logged into your Google account they will remain when you use the site off campus.