To add preheader text, click on the preheader text in the main email window and this will open up the preheader section on the right hand side of the visual editor. If there is no preheader text in your email, then go straight to the preheader section, which you will usually find towards the top of the visual editor. Look for the section that says PREHEADER TEXT and add your text in  the box. Remember to press save.   

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