All you do is log in to DW, go to the page you want to signal boost, highlight any text you want to quote, and then click on the bookmarklet. If it's access-locked, you'll get a pop-up warning you and asking you if you want to continue. On any other webpage, it will automatically redirect to the DW posting window.
To set it up, make a new bookmark, and copy-paste the following as the URL:
posted at https://msilverstar.dreamwidth.org/1019061.html