The Collection Archive pagelet adds a month-by-month breakdown of the posts that have been made to a blog. The date for each post is controlled in the Inspector > Page : Date/time on each posted page within the collection, whether this date is shown on the page or not.

1. Add the Collection Archive pagelet

2. Select the Collection Archive pagelet.

3. Open the Inspector

4. Drag the Target symbol and drop it onto Collection

Note: It makes sense to add the Collection Archive pagelet to the Index page of the Collection that it relates to and have it show on all child pages.