You can create or refer to a collection directly from the browser extension window by nesting your Shortcut. Say if you want to add Shortcut o/insurance to collection o/company-docs, you can simply click on the extension icon, name the Shortcut as o/company-docs/insurance.
Regardless of whether o/company-docs is an existing collection or a new one, o/insurance will be added to it.
The alternate way of creating a new collection is to go to the dashboard (o/+enter). Click on the dropdown option next to New Shortcut at the top right corner of the screen. Choose a new collection, assign it a name, specify who would you like to share it with, and that’s it.