This plugin is meant to be simple, and what it does is shows stats in the mini profile in topics that is based on the users post count.
You can style it more to suit your needs by modifying the mini profile template and using a custom element with a class name "simple-rpg-stats". Otherwise it will just add it to the bottom of the mini profile info.
You can add as many stats as you like, as it works it out from the post count, so doesn't use a key.
For help, or to report bugs, please visit this topic...