How do I change my UBI number in QuickBooks?

I've got the information you need, CindyMc3.

You can modify the UBI number by following these steps:

1. Go to Taxes > Payroll Taxes.
2. Under Taxes, click the Edit your tax setup link.
3. Scroll down and select Washington. When you get a blank page, scroll up and you will see the details.
4. Update the number from the Unified Business Identifier (UBI) Number field. 
5. Hit the OK button.

I'm also adding this article for reference: Changing a state account number.

Please let me know if you need anything else. I'll be around to help you some more. Take care.