Audiences can be defined when creating the message via the creation wizard or from the message dashboard if the message has already been created.
You can establish your main target using the query editor functionalities.
In this tab, the Shortcuts palette only contains predefined filters and the audiences that have been defined in the identified profiles. The Explorer tab allows you to access additional configurations.
Define the Test profiles you want to use for the email. The test profiles will receive the proofs that you can send before to test the email before sending it to the main target.
For more information on configuring test profiles, refer to the Test profiles section.
The audiences block is then updated and shows that a target and test profiles have been selected for the email in question.