Open the Create Audiences page in the side menu. First, select the Ad Account in the search field. The system automatically detects the linked Instagram account, Facebook Page and Pixel. Then turn on the sections you want with each section's Enable button: Instagram Engagement, Facebook Engagement, Video View, Custom Website and Lookalike. Select the audience types you want, choose the Retention Periods (7d, 30d and 90d are selected by default) and check the counter that shows how many audiences will be created. Finally, click Create Audiences. Creation runs in the background, and each audience appears in the progress list with the status Pending, Creating, Created or Error.