Editing the segment
To see what options you have for a segment, click in the row next to a segment. You can rename a segment, create a similar users segment based on it, or grant access to this segment to another Yandex.Audience user.
You can't add own data to an existing segment based on uploaded data. You can only create a new segment and replace the old segment with the new one in your Yandex.Direct and Yandex.Display ad settings.