Once you're set up with an Organization in Edisen, you can start creating your collections within that Organization. When you're ready to create your collection, you can click the "NEW" button on the top-right of the screen and select "Collection".  

You'll be prompted to set a name for your collection so that your team mates can easily recognize it. Open up the additional options menu to add more metadata describing your collection details from the modal. You can also edit or add these in later. Hit "Create" to complete your action and you'll be ready to start adding content to your new collection.
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Full-Screen View: http://help.edisen.com/en/articles/3160123-how-do-i-create-a-collection