atimex, it can't be fixed. That is what Jeju was trying to tell you. For some unknown reason Kia didn't enable that feature in the Souls made for the US market. Apparently they don't realize that sometimes we drive into Canada. Most US residents don't know how to convert to km/h from mi/h. You can, however, go to the GPS section in the center display and have it show your speed in km/h. You could also make a chart of common speeds and the equivalent km/h values and post them by your speedometer. For example 100km/h = 62mph.
David D. Nelson
Blue 2016 Soul EV+ & Cloud 2018 Soul EV+