The first chord is given - Not always are the notes correct!
The easiest way to enter pitches is to click on the first note with a white arrow (press escape until it is white).
The arrow will turn blue or green depending on the part - Blue is voice 1 and the stems go up - Green is Voice 2 and the stems go down -
Play the notes on the keyboard selecting the correct values with the keypad. You must re-enter the first note.
For example to enter the Alto part click on the initial note, then press the same pitch on the keyboard and then continue playing the pitches selecting the values as necessary.
The Alto and Bass parts will have a green arrow while the Soprano and tenor will have blue arrows.
Before switching to a different part, press escape to make the arrow white again (select)
The note value window is a template for the keypad
To change a note value click on the note and select a new value with the keypad.