INCONVENIENCED PAY MY DOCTOR: WHERE'S MY CLIENT ID?

Okay, so, I need to settle my doctor's bill. I logged in the website and it says I need a account number. However, I don't have that! What am I supposed to check? Is there a way to find my client ID? Can someone figure this out. It's really frustrating having to pause payment because of this. Using Veradigm & Pay My Doctor Navigating medical bil