"Add images to your document. You can select previously uploaded pictures, give a direct URL to an image or upload your own image. (optional)" - No, you can not, at least not in the window we are. Please fix it.
"Add pagebreaks to your article. Pagebreaks make a table of contents for your article. (optional)" - This ain't possible either. please fix it.
"Add a readmore tag to your article. Anything past the readmore tag can only be seen if the article is viewed individually. (optional)" - This ain't possible either. please fix it.