Use a button "MORE CURSORS" in main pop-up or follow this link to access the store collections.
On the collections page you can find all available cursor collections.
Once you found cursor collection you like, you can click "ADD" button under it.
Full collection will be automatically added to extension.
You can view packs of the collection by clicking "VIEW". On the pack list page you can find all cursor packs of the chosen collection. Once you found cursor pack you like, you can click "ADD" button under it. A collection with only that pack will be automatically added to extension.