Once logged-in, navigate to your pages list. On the left hand navigation menu, select “Pages”. This will bring up a list of pages on your WordPress site. Scroll through and find the page that you wish to edit, select it to bring up the editor.
One important thing to remember on this page is wether you are in “Visual” or “HTML” mode. These tabs are located in the top right of the content area. I, obviously, suggest “HTML” mode and think that all clients should learn the basic html tags for a better experience with your WordPress blog. If you really do not feel comfortable with HTML mode click on the “Visual” tab to use a WYSIWYG (What you see is what you get) style editor.
All new browsers are tab enabled. Whenever working on a WordPress Page, I have the editor in one tab and then the live site in another. At any time you can click “Publish” or “Update”, switch tabs, and hit refresh to see the fruits of your labor.
If you would like to learn about the basic HTML tags that you would use while editing a WordPress page please visit: Basic HTML Tags for Amateurs.