How can I resend the same email to the same people
In order to send your email to the same list, you would need to make a copy of it. When you are on the Campaigns tab of your account, you can click the "More" icon to the right of the name of your email that you want to resend, and choose copy in the drop down.
Then follow the prompts to schedule this copied email to go to the same list. I hope this helps!