Before sending out your message using Marketing Manager, you'll need to attach a marketing campaign. To do this, simply click the Search icon next to the Campaign field to select a marketing campaign.
Important: There are two places where you can attach a marketing campaign on the Marketing Manager screen. One is in the upper right corner (directly under the toolbar, to the right of the Send Emails checkbox) and the other is under Create Activity. In order for Nex.to to work, you must attach the marketing campaign to your email message using the Campaign field in the upper right corner of Marketing Manager!