Full Answer
Where is the collection icon in Edge?
By default, clicking the Collections icon in the top-right corner of your Edge browser window will show the collection you last accessed.
How to add a note to a collection in Edge?
To add a link to the web page you’re currently on to a Microsoft Edge collection, click the “Add Current Page” option in the Collections feature menu. To add a note, click the New Note button to the right of the “Add Current Page” link.