Hi @MJDuncan,

Thank you for joining the thread. I'll provide you the steps on how you can proceed.

In QuickBooks Desktop (QBDT) for Windows, follow these steps:

1. Go to the Company tab.
2. Select Chart of Accounts.

At this point, you can follow the steps shared by my peer @DivinaMercy_N above. 

For additional details, you can also view this article: Fix beginning balance issues in QuickBooks Desktop. It has the steps on how to resolve a zero balance or an incorrect balance. 

Please know that you're always welcome to post here in the Community if you have other questions. I'll get back to you as soon as I can.