These instruction videos are bit old at this point. The comments in the ace128test example in the arduino library are more complete and up to date. Also see the readme on github.
For basic testing of your module use the ace128_0x20 or ace128_0x38 sketches.
How to run the ACE128test sketch to verify your device is good and the software it set up right.
Overview of the I2C backpack available on Tindie
Making a custom encoder map (only for wiring your own encoder circuits)
Here is an old breadboard setup which should work with the ace128pintest sketch with a direct wired 1602 display. The sketch now uses an I2C backpack display, so just use the serial monitor output.
The Fritzing file for this is in the extras folder.