Hi there, @Ilonna.
You'll want enter the email in the Additional email addresses field when sending the invoice. However, you'll need to enter it every time you send an invoice. I've attached an image below for reference. 
You might also want to check this link that can guide you through the steps on how to add your company logo to your invoices.
Let me know if there's anything you need help with. Our door is always open to help you. Take care and stay healthy!