You will first need to install Node.js and Meteor on your local development machine.
For Node.js, head over to https://nodejs.org/en/ and Download the LTS (left) bundle, and install it on your machine.
For meteor you can follow the instructions at https://www.meteor.com/install.
Once those are all installed, run the following 3 commands in your terminal.
feel free to change
my-experiment with the name of you experiment (no spaces).
npx create-empirica-app my-experiment cd my-experiment meteor
Then open http://localhost:3000/ to see your experiment.
Try and edit files in this folder to change your experiment.