I cant find where to change email address for my company that shows up on the invoices in top left corner.

Hello Granitecityapart, 

Welcome to the Community page, 

So the app is just for basic things, some things you will have to do on  pc/laptop on the web broswer, such has changing your email address in the main account and settings section in your Quickbooks account. 

Good day, jenny888.

Allow me to assist you in updating the email address on your customer's invoice in QuickBooks Online.

If you've set up a company email address in QuickBooks, it will appear on the customer's invoice. If you don't want to change and use the company email, we can add/set a customer facing email as the sender.

Here's how: 

1. Go to the Gear icon in your QuickBooks Online (QBO) account.
2. Choose Account and settings.
3. Select the Company menu and click the Contact info section.
4. Enter an email address in the Customer-facing email field.
5. Hit Save and then Done.

You can also check out this article and learn how to personalise and add specific info to your sales forms: Customise invoices, estimates, and sales receipts in QuickBooks Online.

In addition, I'm adding this link that you can use to track your customers' payments: Record invoice payments in QuickBooks Online.

If you have any further questions about the invoice email address, let me know in the comments. I'm always willing to lend a helping hand. Have a great day!