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You'll check the stats in two places, attributed to the popup, as well as stats for the entire campaign. When you enter your domain -> click "Statistics". Similarly, the same situation occurs within a given popup.
Impressions - is the number of each display for a given popup
Mouse hovers - each time the cursor hovers over a given popup
Clicks - is the number of clicks on a popup, regardless of whether it leads to an external subpage or not
Forms submissions - this is the amount of data left in your campaign - emails, phone numbers