How to update the the docker run command?

I have a hassio docker running on my raspberry PI4 with raspbian. All seems to work fine, except the fact that it looks like my DSMR data is not available in hassio.
I did follow these instructions:
And in there is mentioned that I should update the run command to assure docker has acces to the device.
Can anyone tell me how to update that runcommand? is it stored in some linux file?

Did you ever find the answer for this? I need to do the same.