Using this sketch you can control the Tiny 3-Axis CNC over the USB serial.
Upload the sketch to your Adruino and then open the Arduino IDE's serial monitor (keyboard shortcut: Ctrl+Shift+M). The keys are "WSAD" and "OL". They work as follows:
W = forward
S = back
A = left
D = right
O = up
L = down
To operate the Tiny CNC, type one or more (WSADOL) commands into the serial monitor and hit Enter.