Screen Draw Rated 1 out of 5 stars

Sorry, but I can't get it to work or find info about how to make it work. Have an icon in lower right-hand corner that names itself, but left clicking does nothing and right clicking only brings up the dropdown list for Firefox toolbar configuration. Left and right clicking on any screen results in no on-screen indication. Can't find a FAQ or tutorial illustrating operation. Do see on the Screen Draw site that some control screens exist for line size, but have no idea how to activate them. So can't tell if the tool is one I can use which may mean I shouldn't even rate it.....