G AdMob (by Google) is certainly one of the most used advertising solution for mobile apps.
You will some fields to fill:
- Publisher ID. Add your Publisher ID Click Here to know how to find your Publisher ID.
- Ad Unit ID. Add your Ad Unit ID Click Here to know how to find your Ad Unit ID.
- Ads Position. Let you control Ads Position (Top Center, Bottom Center, Center).
- Ads Size. Let you control Ads Size (Smart Banner, Banner, Medium Rectangle, Full Banner, Leaderboard, Skyscraper).
Update your setting and finally, Press "Save Changes" button.