I hope you can see it 
At the bottom there is the Arduino mega
In the middle is a W5500 Ethernet Shield
And at the top there is the Base Shield.
Is it right, that the output from the Arduino is just 40 miliamperes and the Fingerprintsensor needs 120 miliamperes?
And is it correct, that the Fingerprintsensor just blink red one time, when I connect the Arduino with my Laptop, but then not anymore. Not even when I want to enroll my finger into the Sensor?