Hi DaPixelWizard
On unity, go into "edit / Project Setting / Input".
It will make you apear all the inputs currently set for your scene.
Here, you can add, remove, or change any input.
If you want to know what are the codes of special buttons, just go to the unity website
http://docs.unity3d.com/Manual/class-InputManager.htmlAlso don't forget that in the "get input" action of playmaker, you need to put the name you gave to this input in the input setting, not the name of the actual button on your keyboard.
Hope that'll help, and have a good day!