Your website is live on Vercel, and the code lives on GitHub. But to actually work on it, you need a copy on your machine. This is called cloning — downloading a copy of the project to work on locally.
Go back to your "spa" repository page on GitHub, click the green Code button, and copy the HTTPS URL.

It looks like: https://github.com/{your_username}/spa.git
In VS Code, go to Source Control in the sidebar (the branch icon), click Clone Repository, then paste the URL and press Enter.

VS Code will ask where to save it — pick your home folder or create a Developer folder. Once it finishes, click Open in the dialog that appears.
If you see a "Do you trust the authors?" dialog, click Yes, I trust the authors to enable all VS Code features for this project.

You should see your project files in the left sidebar — the same files you saw on GitHub, now on your machine and ready to edit.

Your project is on your machine now. Before you can run it, there's one quick install step — grabbing the libraries it depends on.