Once you've created your audience, the next step is to connect it to a line item under your campaign by following the steps below:
Step 1: Go to your desired campaign.
Head to the Campaigns page.
Click the Campaign Name to open the campaign.
Then click on the Line Item Name you want to edit.
Step 2: Select your Audience.
In the Targeting step of the setup, choose Audience.
Use the search bar to find and select the audience(s) you want to use.
Step 3: Choose the Audience Type.
Use the dropdown to filter between Audience Builder segments and Customer Lists shared by us.
Select the segments and save the changes.