Coder needed to properly implement pot filte,

My self and several others have experienced fluctuating pot signals resulting in the motors making a crackling noise trying to follow the signal fluctuations
A capacitor on the pots signal line and ground line make a big difference but still leaves some in wanted jitter
I found a site explaining this situation with the adruino reading the signal and how a cap and software filter can stabilize the signal fixing the issue
This explains how https://www.electroniclinic.com/arduino-analog-signal-filter-analog-sensor-value-fluctuates-a-lot/
I found
Arduino Filter for Analog Sensors coding to work the best

after confirming the cap and filter clears up the signal using a print code to see the signal data I added the code to my smc sketch and did not experience the motor noise and jitter from the motor trying to make small adjustments to match the sensor value

I am not very experienced at writing code, I can modify and edit but am not a coder
Can someone with coding knowledge and experience put this filter into the code properly please?
I’m not sure if I implemented it in the correct area and if I did it so it’s reliable

‘this is how and where I put the code

const int FeedbackPin3 = A2; // Motor 3 feedback pin
const int PotInputPin = A5; // User adjustable POT used to scale the motion (if enabled)

//Pot Filter added by J Latka
int PotData = 0;
int filteredValue = 0; // Initialize filtered value
float alpha = 0.05; // Filter coefficient (0 < alpha < 1)
//Pot Filter added by J Latka
int DeadZone1 = 0; // feedback deadzone
int DeadZone2 = 0; // feedback deadzone
int DeadZone3 = 0; // feedback deadzone

This is the original code the filter was derived from in the attached pic