Welcome to Community! QuickBooks Online has the versatility you need to customize your forms to reflect your business. I'd be glad to assist!
You can customize the appearance, add a logo, create a personalized email message and so much more, as noted in this helpful guide. Due to some limitations associated with the QuickBooks app, it's recommended to log into your account from a web browser, to successfully add a logo to your business forms.
If you have any other questions, feel free to reach back out. We're always happy to help!