From the prospect overview page, sort and filter until you have a list of prospects that you're interested in. Click on the checkbox next to the prospect name and locate the button on the top of the page with the ellipses (...) . Select "Export".
The export will include all prospect fields, the last time the prospect was updated, most recent touch, last date of engagement, the engagement score, open, click & reply counts, and any active & finished sequences.
The engagement score is calculated as follows: Outreach will add 1 point for every email opened, 2 points for every click, and 3 points for every response on the most recent mailing.