for hackers

This site can be hacked.

If you find a way in — please be kind. Don't break things, don't wipe data, don't hurt anyone. Instead: leave a mark on the wall below. Paint, draw, write something, decorate. And if you'd like to be remembered, put your name on the list — anonymous, handle, real, up to you.

There's no public form to edit the wall — that's the whole point. Find the endpoint yourself.