From settings,but once you do that,all your purchases will be gone,it's like new account.
Canada and USA is technically the same region,so it's possible to switch back.
This information is old maybe,i don't know if they change it.
The Japanese to USA is require CFW.Just did it, couldn't find anything about Usa to Canada only Jap to USA. I just had to change the country, problem solved.![]()