Hello Whm70,
Welcome to the Community page,
To find your Company ID number in Quickbooks if you can find it in the main cogwheel>account and settings>billing and subscription> on that page at the top it will show you your Company ID number or if you click on the dashboard on the main left-hand side navigation bar hold down ctrl, alt,? at the same time, it will pop a box up and at the top, it will again have your Company ID number there for you.