It should NOT be showing any error pattern, i.e. first LED=red and all other LEDs glowing in some form.
Confirm that there is no Check-Engine light on the Car's dashboard
The "Check Engine" light should not have appeared on the dashboard.
If isn't not there - Congratulations! Its going great!
Start the car's engine
Ensure that the STATE led changes to white, and stays white when you put the car in Drive/Gear and apply acceleration.
Also ensure that the engine responds to accelerator pedal input before you start moving.
Now, start driving your car with NexCruise installed, ensure that the STATE led on the Lightbar stays glowing in white colour when you start moving.
Ensure that it is driving normally
It should be driving like it did before you installed the NexCruise. No surprises. Drive it for a while till you're sure of this.
Engage Cruise at a slow speed
Once you've ensured the above, move to a relatively open road and press the centre cruise button. The green "Cruise" LED should glow on the lightbar and the car should start cruising at the current speed. Take your foot off the accelerator pedal and confirm that cruise is working.
Test dial driving, cruise resume, etc and ensure that other functions are also working as intended.
Once you come to a stop, turn off-on your car a couple of times again without taking special care of anything, and verify that the NexCruise works perfectly each time. Engine light should not appear, and the car should drive perfectly fine.
If everything works, congratulations! Things seem perfectly alright, and your car is now officially powered by NexCruise! Go ahead and put that sticker on your car proudly proclaiming the same :)