Subscribe to blog in comment form

I use the Jetpack plugin so users can subscribe in the comment form. It is not working. Jetpack says:

If your theme uses the old way of displaying comments, we recommend that you contact your theme’s author about updating the theme to use the newest comment function. You can point them to the comment form Codex page in your message: https://codex.www.ads-software.com/Function_Reference/comment_form

Will you be upgrading soon and if so, can you do this?