NCL gymnasium

Im completely stuck on this web application exploitation question where you have to find the username, password of the owner. and to login and see what flag you obtain. If anyone can help me out it would be much appreciated. It says its supposed to be simple but im not familiar with this type of work.

What is the username of the website owner?

What is the password of the account owner?

What is the flag obtained after you login?

https://09cf2ee1930a03ecb555b972605a3a81-doge-community.web.cityinthe.cloud/