If you use electronic drums, here you can find a preset for your particular E-Drum model and instructions on how to adjust the MIDI mapping of the plugin to work together properly with your drum set.
With a Drum Map your DAW can display the correct drum names in the MIDI editor, instead of displaying only blank piano keys on the piano roll. Find and download the drum map for your particular DAW here and see an instruction on how to install the drum map.
MIDI Mapping presets for other drum plugins
These MIDI mapping presets are helpful, if you want to use the grooves and fills from MT-PowerDrumKit together with the drum samples of another drum plugin, like EZ Drummer, Superior Drummer, Addictive Drums, Steven Slate Drums,...etc...