If you want to change the audience members inside of a Dynamic Segment you will need to go into the rule sets of that Dynamic Segments to accompany the subscriber or group of subscribers you want to add to (or remove from) the Segment.
To get to the Dynamic Segment rule sets go to Audience > Segments > use the search bar to find the Dynamic Segment > click on either the Segment name or the purple edit icon in the Segment's Actions column. Here you are able to manipulate the rule sets to include more Audience Members into your Dynamic Segment
To learn more about how to manipulate the rule sets of a Dynamic Segment check out this article here.
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