Impressions, Clicks, and Dismisses are campaign metrics that tell you how well your campaign is doing.
Impressions: The number of times the Call-to-Action has been seen by your users
Clicks: The number of times the user has interacted with the Call-to-Action
Dismisses: The number of times the user clicks on the close button of the Call-to-Action
If you are seeing very low numbers on Impressions and/or clicks you should check your segmentation and the text of the CTA. If you need help, reach out to us in chat on the dashboard.