To delete a contact from your audience, click on the contact from the Audience panel to open their User Profile.
Click the ⚙ icon and select Delete.
Note: This action only deletes contacts one by one and manually. To delete contacts in bulk, refer to this article: https://help.instasent.com/en/articles/6926911-how-to-add-edit-or-delete-contacts-from-a-csv