Hello @aprilc384 ,
If you're needing to resend the exact same email again, you can try a couple different methods.
If there's 500 or less Non-Openers, you can open the email's Did Not Open report, select them all, and do a QuickSend to them. If there's more than 500, you'll need to copy the email, and send that to a list made from the applicable Did Not Open report.