How can I “submit a link to your project's source code in the GitHub Link field”

As the question said, I can’t find the GitHub Link field , could you help me with this, I’m a newbie to github and coding, actually I’m a little panic about github because I don’t know how to use it, thanks!

Your code so far

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Challenge: How to Use package.json, the Core of Any Node.js Project or npm Package

Link to the challenge:

The GitHub Link field is only available for the final certification projects, and won’t be present on the lessons.