Welcome to the Community, @mc3332. I've got here some steps to help you completely delete the transaction in QuickBooks. 

To delete the transactions in the For review section of your bank account, you'll have to Exclude them first. Let me guide you on how:

1. Navigate to the Bookkeeping menu.
2. From the Transactions page, select the bank account where the transaction you want to delete is located.
3. Then, select the For review tab.
4. Check the box of the transaction you want to delete and select the Exclude option.
5. Once done, go to the Excluded tab.
6. Next, check the box of the transaction and choose Delete.

Please visit this article for reference about the process: Exclude a bank transaction you downloaded into QuickBooks Online.

For manually added entries, you simply need to open the transaction form, click the More option located at the bottom, and choose Delete. This will completely erase the data in your books. Check out this link for more details: Void or delete transactions in QuickBooks Online.

The program also allows you to create rules to speed up the review process. This will automatically categorize the downloaded transactions into the correct accounts. 

Please post again here if you have any other concerns about deleting transactions in QuickBooks. I want to ensure you'll be able to do this smoothly. Have a good day ahead.