Go to [https://quickbooks.intuit.com/](https://quickbooks.intuit.com/)
Click "Banking"
Select the bank account.
Navigate to the transaction you want to categorize
Click "Categorize"
Click the "Select payee" field.
Click the "Select category" field and select the income account.
Select travel for Credit Card rewards for travel miles.
Enter the description in the "Memo field".
Click "Add"