Welcome to the Community, @HelenColeman. 

I'm here to assist you with deleting a deposit in QuickBooks Desktop.

The Delete Deposit option will only show on the Edit toolbar if you select the deposit within the register.

Here's how:

1. Click Lists at the top menu bar.
2. Click Chart of Accounts.
3. Double-click the account.
4. Double-click the deposit.
5. Now click the Edit tab at the top menu bar.
6. You can select Delete Deposit if you want to delete the entire deposit.

You might also want to check this article that can guide you effectively in reconciling your accounts: Reconcile an account in QuickBooks Desktop.

 You can always get back to me whenever you have other concerns or questions about deposits in QuickBooks Desktop. I'm more than happy to help you.