Welcome to the QuickBooks Community! As you can see, it's a great forum for asking your questions and getting insight from other users. There are also members of the QuickBooks Team, like myself, here to shed some light on things as well, and I'm here to share some additional information to make sure you have the details you need for using QuickBooks Online in Canada.
One of the great things about QuickBooks Online being accessed via a browser is that it can be accessed from virtually anywhere. Once you have an account set up, it's just a matter of going to the website you usually use to login and then entering your login details. For instance, if you're using QuickBooks Online Canada, you can follow these steps in Canada and elsewhere to access your books.
As Fiat Lux mentions, please feel free to share if you have a specific question or concern about using QuickBooks in Canada. The more details you share, the better, since then we'll be able to respond to your specific situation. Keep in mind not to share private information though since this is a public forum.