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Welcome and thanks for dropping by the Community, @joankmann.
Since the entries were already posted, you can edit them in the register to make some changes. The steps to do this are pretty quick and easy. Here's how:
If you want to learn more about entering split transactions in QBO, check out this article: Enter a split transaction into the register.
You can also add transactions directly to the register. Refer to this article for more information: Add transactions to account registers in QuickBooks Online.
Reach out to me in the comment section below if you have any additional questions. I'll be here to help. Have a good one!