You set up the groups within the lists in the MailChimp Interface. Once groups are set up within a list, you select that list in the Event editor in the MailChimp List Integration box. Once a list that has groups is selected a new select box will appear below that will let you select a group.
If you haven’t set up groups yet in MailChimp, here are a few links to MailChimp’s documentation that will help:
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