StoryChief - Twitter Thread Designer

literally not working at all. it seems i'm supposed to have the option on a twitter thread to click "Thread designer", but it has not showed up, even on their sample thread. i've refreshed the page, tried different threads, and relaunched chrome, but nothing's changed. the "Thread designer" is seemingly the only way to use this, as I can't do anything but view instructions from the extension toolbar

Super convenient tool! :)