You may insert hyperlinks, tables, images, multimedia objects (flash or other movie formats) by clicking on the associated editor control buttons near the bottom. Most of them will ask for additional information in a popup window.
Sample snapshot (showing a popup for 'image insert'):
You may also use "Copy/Cut-Paste" to bring content from some existing document. However, the content inserted with the "Copy/Cut-Paste" method may not carry the format of the source, because "internal" transfer of content from source to the 0sEd editor will depend on the applications and the operating system involved. You might have to put extra effort to get the pasted content in desirable format. (Knowledge of HTML will allow you to directly modify the HTML code to get the desired format.)
