I put the band on backwards. How do I get it off?

You should have received a quick start guide that shows where the button was, you can also use your Books app to download the user guide and they have a YouTube channel with videos.

Not user how you did that, but just press the button and slide it out.

You have to follow the video to fix the issue.

https://www.youtube.com/watch?v=cHkjFIvRb6k!