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Good day, Crystalj.
You will have to select the Name (Customer, Vendor, or Employee), and account, so the journal entry is linked to your transactions.
I've got a sample screenshot here for a reference:
If you want to know the accounts affected on each transaction, you can open the Transaction Journal.
Please see the sample screenshot below:
The following article includes more details: Create a journal entry in QuickBooks Online.
I'm just a few clicks away if you have more questions or other concerns. Thanks.