Are your campaigns and subscribers all ready? If you haven’t created your campaign yet, check this link out to discover how it is done. If you haven’t transferred your subscribers yet, check this link out to see how you can do it.
After preparing your campaign, you can proceed by clicking SEND at the top right corner of the screenshot below.
Them you will see the sending settings page. On this page, you can choose the sending list you already created, select your sender account and indicate the sending time.