Type an appropriate email subject in the Subject field, the default email subject may not be appropraite if you are resending your sales quote or forwarding to more contacts other than the primary customer contact.
Now type the email address of any other customer contact you want to send this sales quote to (in additional to the primary contact in the To data field), these email addresses can be typed in to the CC (Type email address and press enter) data field.
Now type your email message (the default email content will be shown as normal, however given you are resending this sales quote it might be appropriate to type a different message for your customer to read). Be careful not to remove the link to open the sales quote in the email message.
Now click on the Send button to transmit the email to your customer.