To begin the design or editing process of a campaign click the chosen campaign name or click the icon to view and modify properties and associated contacts.

On the right side of the page click Design.

Here you can select a letterhead, mode (text or HTML) and a POP account (you can create a new account by clicking the New E-Mail Account link) from the drop down menus. The box is already checked to create a recurring campaign; if you do not the campaign to occur more than once, uncheck the box.