Where would I find "Zoho CRM ID of the user" on my account?

Where would I find "Zoho CRM ID of the user" on my account?

Hello,

We are using itduzzit.com to automate our sales order udates to the Zoho CRM. Recently some changes were made to the Users in our account and I need to find the CRM ID for one of our users so I can assign sales orders to them. I can't for the life of me find where this number is. It should either be a six or eighteen digit number. Is it somewhere in the UI?