How to connect shopify store to the application?

I follow this link # 3 to Embed the application with store https://developers.shopify.com/tutorials/build-a-shopify-app-with-node-and-react/embed-your-app-in-shopify#get-a-shopify-api-key
But there’s output like this

Without seeing your code, it is difficult to know what the exact issue is. Can you post a link to your project code (i.e. codesandbox.io or GitHub)?

https://github.com/unknouun/eotb Here is the link .

The link you provided is invalid.

Yeah .sorry because it’s a private repo . can you please guide me about how do i connect my application to the store as i follow this link but it does not work . https://developers.shopify.com/tutorials/build-a-shopify-app-with-node-and-react/embed-your-app-in-shopify#get-a-shopify-api-key