How do I get the Desktop to connect to DockerHub?

I got a Docker Desktop in Windows 10. The thing is I am not sure how to use this Docker desktop and how to make the Docker image pushed up to Dockerhub.

Furthermore, I can’t remember the password to log in using the Desktop’s but was able to log in to the browser. There is no re-set password so I am rather confused what to do.

Could someone explains to me abit?

Tks.