View all your segments by clicking Segments in the left sidebar.

From here you can create new Live or Static Segments.

Hover over a Static Segment and click Actions to add users to the segment, view users, email users, rename the segment or delete it.

Hover over a Live Segment and click Actions to refresh it, view users, email users, rename the segment or delete it.

See What are segments? and How do I create a Live Segment? for more details.

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