You can easily edit a Page after it has been published.
Click the Pages link.
Pages is designed to open to the front page for the course, if there is a front page selected. select a page from the Pages Index.
Click the title of the page you wish to change.
Click the Edit button to make changes to the page.
Add content to your page using the Content Selector [1] on the right slide bar. Edit the content and add links and media using the Rich Content Editor [2] or switch to the HTML Editor [3].
Click the Save changes button.