You will need to add a placeholder link or text to your email. The format of that placeholder depends on your Email Service Provider. For example, in MailChimp this is how these placeholders are called Merge Tags. You can read more about it here.

MailChimp is using the tag *|UNSUB|* for unsubscribe links.

What you need to do in Chamaileon is, to add an unsubscribe text in the footer.

Let us know if you have any other questions!