Install programs (I guess I did well) and my problem begins when I try to write the path for the "Program" section in the File Watcher.
Which one is the right path?
It must be a part to (globally installed) Jade executable, like C:\Users\your.name\AppData\Roaming\npm\jade.cmd if you are on Windows or /usr/local/bin/jade on OSX.
Do you have Jade installed globally? Please run 'npm install jade -g', then test jade in your system terminal by running 'jade <your jade file>.jade'. Then specify a path to installed jade script as a 'Program' in your file watcher