To create a notecard, hover over and click on New of a particular source.
This will open up a new menu. You will see a variety of options where you can add direct quotes, make summaries, and write up any of your ideas. Make sure to name your Notecard in the Notecard Title field. It will help you to keep track of all your notecards. You can also create your own tags! And remember to save and close when you finish
To view all your notecards, click on the little orange square symbol.
If you would like more information on creating and managing notecards, you might find these two videos helpful.