Grounding Vcc and Vee?
Those are "decoupling capacitors". This Answer does an excellent job explaining why you use them.

The component is called a capacitor, and in this case the capacitors are used for decoupling. A capacitor is a low impedance at high frequencies (like the frequency of noise you want to remove from your VCC and VEE supplies). At low frequencies (like DC), the capacitor is a high impedance.

You should look at the documentation for your device to figure out what voltage supplies you need to connect to VCC, VEE, and GND.

You should put your oscilloscope probe ground on GND.