i'm taken look at the source code of it.
if you click the button, it redirects to BLF threads but it's randomnized with 10000 to 317000.
//really simple code haha
function picktopic() {
var topic = "https://forum.blockland.us/?topic=" + Math.floor((Math.random() * 317000) + 10000);
window.location.href = topic;
}