Did you know that we have a tutorial for Addictive Drums 2 accessible within the plug-in? Just click on the menu icon in the top right corner of Addictive Drums 2 to find the Tutorials menu. Besides an overarching Welcome Tutorial there is also a Map Window Tutorial for mapping midi input, for example if you're using an e-drum kit or external midi files.
For even more information check out the Addictive Drums 2 Manual.