If you have closed your printer.cfg file, please re-open it.

Locate the step_distance line in the [extruder] section.

Comment out the existing step_distance configuration by adding a # to the start of the line.

Copy and paste the new value into the config under the previous entry.

Save your config

Restart klipper by issuing a "FIRMWARE_RESTART" command in the OctoPrint terminal window.