Getting Started With Content
To add content or to make any changes to your site, you’ll need to go to your WordPress dashboard:
There you can enter content (i.e. “pages” and “posts”), and organize it with tags, categories, and menus, decorate it with images and videos, and make it accessible in sidebars using widgets.
For a detailed primer on WordPress, please see WordPress Basics.
Also, by default, some options are hidden on the Dashboard to not overwhelm the users. See the “Screen Options” tab on your Dashboard for more information.
Many file types can be uploaded to your sites Media Library. Here is a list that the Commons allows. Many of these can be embedded into your automatically or with the help of plugins.