Adding 'Unsubscribe' Button using HTML Code

We are trying to convert all our email designs into HTML and CSS, instead of using the current keap email builder. I am trying to add a “Unsubscribe” Button to my emails that are currently written in HTML and CSS because currently there is no way for our leads to OPT-OUT of our email campaign. If anyone could provide some type of guidance to resolve this issue that would be great.

I’m trying to figure out the same thing - were you able to get to the bottom of this?

Yes I was able to resolve this issue by using this: ~OptOut_11~