It's meant to work with the life and mana bars at this position:

Please note that the position in pixels will vary depending on OS and monitor size, theres a method commented out in the index.js to assist you in collecting this data, and then update the config.json with it.

Just setup the hotkeys in the config.json and run it.

PS.: you might need to force npm install with python 2.7: npm i --python=python2.7

Also double check the robotjs npm page and make sure you have all the necessary libraries intalled in your OS before running npm install