When you are on your Dashboard, typing your article, you can use the icons in the form to create the right lay-out for the item, including scripts and multimedia.

Start4all.com has some handy shortcuts to make live a bit easier: 

Alt+P - publish your article
Alt+B - bold
Alt+I - italic
Alt+Q - Blockquote
Alt+T - more (Read More tag)
Alt+U - ul (Unordered list)
Alt+O - ol (Ordered list)
Alt+L - li (list item)
Alt+A - link
Alt+C - code
Alt+S - ins
Alt+D - del