QuickBooks is a great program for managing your multi-currency transactions. I'll be happy to share more info and make sure you're back on track so you can focus on what you enjoy.
At this time, you can't edit the account that was set up in CAD. You'll have to create a new account using the correct currency. Here's how:
Note: The only accounts that can used multicurrency are Bank, Credit Card, Accounts Receivable and Accounts Payable.
Give this a try and in case you have other questions, feel free to contact our support team using this link here.