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Adding the spell check function to QuickBooks Online would be a great idea, @lbacon.
As of the moment, activation for spell check can only be accomplished by going through your browser settings.
Here's how to do it in Chrome:
This option is usually displayed under Languages for other browsers.
You might want to visit this page here that contains several topics about account management. Just select each box, then it will breakdown some resources that helps you learn more.
Please tag my name in the comment section if there is anything else you need. I'm always glad to help in any way I can.