First, open your booth from the Company Portal or from the Expo area, then click on the analytics icon in the top dark bar:
Note that you have to be one of the booth members in order to have access to the analytics.
Also, you can access reports directly from the Company Portal. Just click "Insights" on the selected booth.
After an event you'll get booth reports with the following attendees' data:
Number of visits per attendee
Link to an attendee profile
Click any of the download links to save the booth attendance log in .CSV or XLS format.
Please note that analytics is available 12 hours after the start of the event.