Here are a few screen shots on how to use Lightroom to prepare a picture for uploading to our Boomerartist website. Pictures need to be no larger than 800 pixels wide, otherwise they will spill over the side of the comment page. You can still view the oversize (spilled over) picture by clicking on it and opening it in a new browser window. But proper procedure is to be able to view it fully in the web page. So please export digital photos 800 pixels wide before uploading them in the Boomerartist comments.
So here are the screenshots.