Create an Engagement Custom Audience from lead form interactions

1. Go to your Audiences.
2. Click the Create Audience drop-down and select Custom Audience.

   Note: If you've never created an audience of any kind before, you'll see a Create a Custom Audiences button, not a drop-down. Everything else will be the same.

3. Click Engagement.
4. Click Lead ad.
5. In the "Lead form" field, choose the lead ads form that you want to use.
6. In the "Include" field, choose the type of form engagement that you want to use.
7. In the "In the past" field, enter the number of days you want us to go back to collect engagement
   Important: If you tell us to go back 30 days and someone engaged 29 days ago, they'll be in your audience. However, if they fail to engage the next day, they'll then be removed from it. Anyone new who engages within the time period you choose will be added to the audience. This means that the audience is constantly being refreshed, so you don't need to edit or create a new Engagement Custom Audience unless you want to change the time period or the type of engagement.
8. Add an audience name (and description, if you want to).
9. Click Save.

* Nguồn: Facebook