Hi, Bsrakkar.
I'm here to help. If they're not processed yet, the paycheck will need to be deleted. Please view this article and follow the steps on how to delete them: Delete Or Void Paychecks.
If you're using Direct Deposit, you will need to delete the transactions before 5 PM, two banking days before the check date. Otherwise, we will not be able to stop the transactions from posting to the employee's accounts. Check out this article for more details: Can I Cancel Direct Deposit Payments After it's Sent?
You can always reprocess the payroll after it's been deleted. Just reach out to me here if I can help with anything else.