How can I delete an accountant user in my QBO file?

Who is the Primary Admin? Your former accountant or someone else?

Hello connie-conniebak. Glad to have you join the Community. I'll be happy to guide you on the right path from here. Here's how to delete a user on your QBO file: 

1. Go to Settings ⚙, then select Manage users.
2. Select the ellipsis icon on the user you want to delete, then select Delete.
3. Select Delete user from the pop-up window to confirm.

Give these steps a try and let me know how you make out. I'll be one message away.