You can edit an audience to change its targeting.
From the Campaign Overview page, select the campaign that the audience belongs to.
On the Campaign Details page, for the audience that you want to edit, click Edit campaign in the Actions column.
The audience wizard appears, and you can edit the audience targeting. The audience wizard experience is identical to creating a new audience, except the wizard is prepopulated with the audience’s current targeting. You can jump to any step in the wizard to edit targeting criteria.
Once you’ve made the necessary edits to your audience, click Save.