You can make a change without having anything running on your local system.
After you find the file you want to modify within the GitHub interface, click the pencil icon to start editing the file. This will automatically create a fork of the project, if you don't have one already.
Below is a template of what the challenge markdown files look like.
**Notes:**
1. In the below sections, examples of `{ext}` are:
*`html` - HTML/CSS
*`js` - JavaScript
*`jsx` - JSX
2. For the `Tests` section below, `text` and `testString` should be valid YAML strings. `testString` can be a stringified function or expression possibly using Chai asserts.
2. [Challenge types](https://github.com/freeCodeCamp/learn/blob/a5cb25704168aa37f59a582f0bb5a19b7bd89b46/utils/challengeTypes.js) - what the numeric challenge type values mean (enum).
3. [Contributing to FreeCodeCamp - Writing ES6 Challenge Tests ](https://www.youtube.com/watch?v=iOdD84OSfAE#t=2h49m55s) - a video following [Ethan Arrowood](https://twitter.com/ArrowoodTech) as he contributes to the old version of the curriculum