By mistake I set up my account for Canada location. lease help me to change it to USA.

Welcome to the Community, @rakesh-jain.

You'll have to cancel and subscribe QuickBooks again to change the location. And I'd be happy you through the steps.

To cancel the QuickBooks account, here's how:

1. Go to the Gear icon.
2. Select Account and Settings.
3. Click the Billing and Subscription tab.
4. In the QuickBooks section, select Cancel.
5. Follow the steps on screen to cancel your subscription.

Once done, an email will be sent to confirm that your subscription has been canceled. 

You can read this article for your reference: Cancel your QuickBooks Online Subscription or Trial.

Then, you can now subscribe for a new QuickBooks account again with the correct location.

In case you need tips and related articles in the future, visit our QuickBooks Community help website for reference: QBO Self-help. 

Please feel free to post any questions you have below. The Community is always here to help out.