This page shows you, how to implement the Floodlight Counter Tag via Google Tag Manager.
Go to your Google Tag Manager Workspace
Navigate to Tags (1) and click New (2) in the top-right corner
Within the Tag Configuration section select Floodlight Counter. The Floodlight Counter Template will open next.
Give your tag a name (F0 Floodlight Tag) and enter the information from your Campaign Manager 360 account: https://support.google.com/tagmanager/answer/6107168
Choose Counting Method Standard
In the Triggering section you need to assign the F0 Trigger you have created before.
Save the configuration