How do I edit the target audience of a campaign in the Impact Dashboard?
You access the campaign and edit the target audience assigned to it.
In Global Navigation, click the Campaigns link .
In the All Campaigns tab , click on the campaign you for which you want to change the target audience .
Edit Target Audience
You can change the audience by picking any combination of roles , filters , user segments , or individual users  and click Outcomes button  to continue.