How do I amend the accountant's details?

Hello, andrea11. 

Here’s how you can amend account details in QuickBooks Online:

1. Click the Gear icon at the top.
2. Select Chart of Accounts under Your Company.
3. Locate the account involved.
4. Click the arrow next to Account history/View Register.
5. Select Edit.
6. Update the information as you desired.
7. Click Save and Close.

I also have an article that might able to help you along the way: https://quickbooks.intuit.com/community/Help-Articles/How-to-view-or-change-account-detail-types/m-p/186108.

Drop by again if there’s anything else you need about QuickBooks.