Renault kangoo van

[Dozerdriver]

Hi all and thanks for adding me, I've recently bought a 2014 kangoo van I'm very happy with it except for it showing km instead of miles, I have tried to change it using the buttons on end of wiper stalk but no luck, it has an after market radio fitted not sure if it could be changed through original radio or is it a dealer job, any info would be appreciated.