Hi,

Welcome to the forum. That is courageous of you to import a foreign car.
You should have taken it from Canada, everything will be already metric in it ;-p

I checked the owner manual and the FSM, and did not find anything about it (except that you can display one or the other). No explanation on how to switch from one to the other.
And since I don't have the premium package on my car, I cannot play with it to find out, sorry.

Can you contact a local Nissan dealer to help you on that? Or Nissan Brazil maybe?

How will you do with the odometer? Not easy to see the kph in the inside circle. Did you plan to change to a metric dashboard?