I'll give steps to help you find the transactions, FMW.
If the transactions imported are not yet added to the register, you can find them and add the memo by following these steps:
- Go to Banking > Bank Feeds > Bank Feeds Center.
- In the BANK ACCOUNTS section, select the credit card account under CREDIT CARD.
- Click the Transaction List button to view the transactions.
- Select the From and To date, and put a check mark on the transaction you want to add.
- Under the ACTION column, select Add More Details from the drop-down.
- In the Add More Details window, you can add the Memo.
- Hit Add to QuickBooks.
I've a sample screenshots below for a visual guide:

Otherwise, open the account in the Chart of Accounts to edit the transaction.
Here's how:
- Go to Lists > Chart of Accounts.
- Type the credit card name on the search field and click Search.
- Double-click the credit card account and find the transactions.
- Double-click the Date of the transaction you want to edit. This will open the transaction, so you can add a Memo.
- Click Save and Close.
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If you have any follow-up questions about the bank feeds in QuickBooks, please let me know. I'm just a few clicks away to help you some more.