Okay? What's your question exactly? You can build something like this with PHP. If you don't know PHP, you'll need to learn first. W3Schools has a decent PHP tutorial. But nobody here is going to build this for you.

I am new to php and html. What I am looking to do is very simple (I think). I want people to be able to create an account, no registration or email, just type in what they want there username and password to be, and have that information saved on my servers. All I want is a box, not a forums with categories, just a box, where when people type something it shows up in the box with their name, and after 1 hour it deletes the message. Also, I would like people to be able to post pictures and documents on it to, for people to download and such, but to save room on the servers everything gets deleted after 1 hour