Where do I find our company's Quick Books ID number?

Hello, beth-thehorseofc. 

Thanks for joining the QuickBooks Community, I'm happy to show you how to change your ID. Follow allow below:

1. Sign in to QuickBooks Online.
2. Go to Settings ⚙ and select Intuit Account.
3. To change your user ID or email address, enter your password, then select Edit and Save.
4. To change your password, select Password, then select Edit and Save.

Once those steps are complete, you should be good to go. I'm including a link to a helpful article highlighting the above steps as well as additional information regarding how to change your email and password. 

If you have any other questions or concerns, feel free to post in the Community any time. Thanks again and have a lovely afternoon.