Q. How do I add an Unsubscribe Link in a Mosaico Template?
A. Select an area in your template where you can add text and you should see the option to add a token.
Select to add the token 'Unsubscribe via Webpage'.
If you want the unsubscribe link to display the words unsubscribe, click on the link icon add set the URL to your token value and the Text to Display to Unsubscribe.