You can take a quick peek at your campaign-in-progress by hovering over the Preview & Test button at the top of the page and selecting Enter Preview Mode. In this view click on the View Live Merge Info button to see your Merge Tags in action. Once you're finished checking out your web preview you can return to the editor by clicking the X in the top of the screen,selecting Exit Preview Mode from the Preview & Test button, or using the escape key on your keyboard.

We recommend sending yourself some test emails in addition to viewing the web preview. The Send a Test Email option under the Preview & Test drop down is the easiest way to initiate a test email. Web based previews provide a solid overview of what a campaign will look like, but individual email client quirks are best found through test emails.

You can also test Merge Tags by sending your campaign to a test list. When you send tests using the Send a Test Email option, the Merge Tags aren't fully live because we're not pulling any data from your list. When you send to a live list (even if it's a test live list) we can activate the Merge Tags.

Vist MailChimp's Knowledge Base for more tips on adding and editing content.