A placement is the location where your ad is shown, for example Instagram, Audience Network and Facebook in-stream video.

You can edit the placement of multiple ad sets at once in Ads Manager.

1. Click the Ad Set tab.
2. Check the box next to each ad set you want to edit.
3. Click open the Edit drop down menu, scroll down and choose Placements.
4. In the editing window that appears check the box next to each ad set you want to edit.
5. Click Actions. Choose to Add Placement, Remove Placement, or Switch to Auto Placements.
6. Make your changes to the placement of your ad sets and click Publish.

* Nguồn: Facebook