New User Needs Help

Hi I just purchased Cubase 8 Pro and need help assigning different sounds from different kits to my MIDI. I have an AKAI MPK Mini 2 and it plays the different kits fine but I don’t know how to assign different sounds to different keys, pads etc. For example If I am playing kit from HALion Sonic I can play it with the preset way the kit is mapped out on my MIDI, but don’t know how to change the different keys to different sounds.

If anyone could show me how to do this it would be a huge help.