Using your assigned credentials login below. Once you're logged in, use the site's navigation to find the page(s) you want to update/edit. When you get to the page you'll see an edit button near the bottom of the content article. Click the edit button, and the WYSIWYG editor will open. Create your edits, when you're finished click the 'save' button.
When you've made all the necessary edits, return to this page and logout.