Cannot enter the contents website after login

Hi there, Im a newbee here and when I finished the four steps following the turotiral Basic Steps | Decap CMS | Open-Source Content Management System, I can check my website/admin has the login window with github outh app and I could be authorized by the github web app.
However, there is nothing happen after the authorization. I cannot go into the admin website and cannot see any contents. It always keep the login window like below. What should I do now? Any idea please?

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