Navigate to Meta Ads Manager and select 'Audiences' from the left-hand navigation menu under 'Tools'.
Click the 'Create Audience' dropdown and choose the desired audience type: 'Custom Audience', 'Lookalike Audience', or 'Saved Audience'.
For a Custom Audience: Select your source (e.g., 'Website' for Meta Pixel data, 'Customer List' for CRM data, 'App Activity', 'Video' for engagement data). Follow the prompts to define parameters (e.g., website events, customer file upload, specific video views).
For a Lookalike Audience: Choose a 'Source' (a Custom Audience, Page, or app with at least 100 people from a single country). Select the 'Audience Location' (country). Define the 'Audience Size' (typically 1-10% of the source, with 1-3% being most similar).
For a Saved Audience (Core Targeting): Define 'Location', 'Age', 'Gender', 'Detailed Targeting' (interests, behaviors, demographics). Use 'Exclude' and 'Narrow Audience' options for precision.
Name your audience clearly and click 'Create Audience'.
Once created, navigate to your Ad Set creation flow within Ads Manager. Under the 'Audience' section, select your newly created audience or choose 'Advantage+ Audience' for AI-driven targeting. Add any necessary exclusions.
Review your audience selection to ensure it aligns with your campaign objective and budget before publishing your ad set.