GD Affiliate Center 1.3 is big improvement over previous versions, expanding existing and adding new features including improved interface, code builder panel, new charts and usage of priorities calculations for displaying ads. Here is the video showing all plugin features.
To quickly insert ads into posts, you can use shortcodes, and plugin will replace them with ads. Shortcodes support similar set of parameters as the functions do, only they are used in the post not as PHP functions in the theme/plugin source code. There are two shortcodes available right now.