Alexa and Hopper w/ Sling

I've been waiting to try this out since I saw it at CES and now that it's available, I can't figure out how to get it working. I went to the Settings Menu on my Hopper w/ Sling but don't see the "Amazon Alexa" option.

Is Alexa supposed to work with Hopper w/ Sling? If so, I guess I need a particular version of software? How do I do that upgrade?

I did a quick search but didn't see any references to this.

Thanks!