Does this do anything in chrome?
No button. no nothing.
It won't work properly if you aren't logged into your blockland forums account. If you are logged in, make sure you downloaded the extension and have it enabled.
In chrome, go to settings > extensions, and make sure 'Show Last Topics' is enabled. Then go to anyone's profile page on forums while logged in, and you should see the 'Show last topics of this person' option at the bottom.