To add an unsubscribe link, or to use merge tags like Names and dates, follow these steps:
1.) In your message, insert a text block.
2.) Place the cursor where you would like to insert the merge tag.
3.) On the text toolbar, select merge tags and then select the tag you would like to use.
4.) For the name tag, you can set what text will show if no name was given. For instance, if the name was left blank, you can use [Name,fallback=Friend] and any name that was left blank will be replaced will Friend. By default, it's set to blank.
5.) For unsubscribe links, you can use custom text and highlight that text and select unsubscribe. It will then turn your text into an unsubscribe link.