After you’ve created an account, you can favorite tracks to quickly save them for later or archive them to your own created collections.
To favorite a track: click on the star-symbol in the track player.
Your tracks marked as favorites can be found by clicking "Favorites", under "Your Library" on the main page.
To add a track to your collections: click on the plus-symbol in the track player. You can choose to add the track to a previously created collection or to create a new collection for which to add the track.
You can find your created collections, or create a new one, under "Your Collections" on the main page.
All your downloaded tracks are automatically saved to "Downloads", which can be found under "Your Library" on the main page or in the drop down menu.