How to increase mouse scroll speed - explained for begginers?

I want to increase the mouse scroll wheel speed, and I found no answers for beginners (Ubuntu 21.04) with all the steps properly explained.

EG:
For example, I read a line beginning with

sudo apt-get install imwheel... 

OK, so I attempt to copy paste the line into a Terminal~, but then...says to edit a file...
Wait, what file, where can I find this file, and how do I edit it?
Why don't you add the command path and the command for edit for edit task?

It would be a lot better if the indications would regard the beginner level, and even better if I could do that from Settings panel in Ubuntu.

1 Answer

To change the mouse parameters:

• list the peripherals, note the good number with the device name of the mouse!

   xinput list

• list parameters from peripheral number 9

   xinput list-props 9

• set the acceleration of peripheral 9 to value 3. The higher the value is, the more you divide the acceleration. Acceleration is maximum for a value equal to 1. The "basis" value seems to be 1.7, for me...

   xinput set-prop 9 'Device Accel Constant Deceleration' 3

To permanently set the change :
A hidden file in your directory is ".profile" (Ctrl+H to see hidden files) Double click on it and open it. Copy paste the previous command at the end. That's it!

Source

Hope it will work.