My reply above gives you the full setup needed to perform any action on CBSubs subscription status change. I've covered expiration and activation. You'll need both since 1 will add the usergroup when they subscribe and 1 will remove the usergroup when they expire/cancel. Be sure to set Type to Usergroup for the usergroup action. As for PLAN_ID_HERE be sure to replace that with your actual plan id which you can find in the CB Paid Subscriptions > Plans table.