Start by filing in the recipients.
Then you write what will be the Sender name of the Email, which Email the recipients will reply to, the Subject of the Email, Email Type, and then the campaign. I the end you choose if the email should be sent Now or Later.
If you choose for the email to be sent later, you choose time and date on the bottom of the page.
On the right side of the screen you can get a preview of the email by clicking on "preview template".
Use the "Send test email" function to send yourself a test mail before distributing. Then you can see what the complete email will look like.
When you are happy with the email, press Distribute Campaign. NOTE. Look over your email before you send it, once you distribute it, there is no way back.