In order to add Add4Game as the CPAPI source you need to:
1) Click on Demand source > New Demand Source:
2) Use Search to choose Add4Game network type:
3) Fill in the fields with API credentials. Also, you will see a recommended macro set for Add4Game and Affise integration.
4) After successful adding the new source you would see Ready status of the source.
Your next step would be Creating a Campaign. Please follow these instructions.
Should you need any further assistance regarding CPAPI, please, contact email@example.com.