You were on the right track-- "getKey" on its own returns a single keypress, but you can also use "getKey(n)" to check if key "n" is pressed (it returns 0 for not pressed, 1 for pressed).
So if you want to check for both Enter and the Down arrow, simultaneously:
If getKey(9)
//Enter is pressed
End
If getKey(1)
//Down is pressed
End
You can also do some useful arithmetic, like if you have (X,Y) coordinates, you might want:
X+getKey(3)-getKey(2)→X
Y+getKey(1)-getKey(4)→Y
And that has a bonus of letting the user press multiple arrow keys simultaneously
Hopefully that helps!
EDIT: Also, welcome to Omninaga, you should
Introduce Yourself!