VIEW menu check "virtual midi keyboard" OR AltB brings up the keyboard
TRACK MENU "Insert a new track"
Right click the track record arm button, choose INPUT: MIDI VIRTUAL KEYBOARD ALL CHANNELS
Arm the track by clicking on he record arm button so it turns red
Make sure the keyboard is IN SCOPE (click on the bar at the top of it)
Now your PC keyboard will trigger midi notes - the bottom row starting at Z are the white keys, the middle row starting with the S are the black notes (or you can click on keys with the mouse...)
To set which note is the center of the virtual keyboard, right click any note and it will become the center