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

Okay, therefore, I need to pay my doctor's statement. I logged in the portal and it says I need a account number. Unfortunately, I can't that! What am I supposed to do? Is there a way to access my client ID? Please figure this out. It's really bothering having to pause payment because of this. Veradigm and Pay My Doctor: How to Use It Navigating