Where to connect the power supply
As you can see from the diagram Pin 20 is V+ and therefore that is where your positive power supply should go, also Pin 19 and Pin 8 are 0V so you will need to wire these to the ground of your power supply.

The rest of the pins are inputs or outputs or other functions which can be specified in the code you write for the chip. The resonator pins (Pin 9 &amp; Pin 10) is where you would connect the clock source for the chip which would give it the timings it needs (not necessary if it's got an in built oscillator).

V+ is always where you connect the power supply unless specifically stated otherwise (not likely) and 0V or GND is where you connect your power supply's ground.