Wait. I need to tell you that this plugin uses variables, not the actual health of followers or player that you set up in the database. It's not really the purpose of the plugin. I've updated the feature to follow events and players in version 1.1.3, but if you want to treat a variable as the HP value in the database, you'd need to assign that variable as $gameParty.leader().hp (the script section in Control Variable command)
If you need more help on this, feel free to message me via my Discord. Working in real-time is much faster: SangHendrix#3505