A web page must be accessed through the "sites" app for editing.
Select the site to be edited, then browse to the page to be edited.
You may want to add a file to your page, such as a form as a pdf document, a word file, etc. To add a file, simply click on the "Add files" icon near the bottom of your page. The file will appear in the files area, but the purpose of the file may be unclear to a site visitor. You might include a description of the file in the text of your page.That text might even include a hyperlink to the file. To create a hyperlink, first add the file to your page and click on the file link at the bottom of the page. When the file opens in a browser window, copy the URL. Add a link to your text by clicking the chain link icon in the menu area. Select "Web address" for the link type, and paste the URL into the "Link to this URL:" box. In the "Test to display:" box, type in the text for the hyperlink. Finally, you will probably want to check the "Open this link in a new window" so that the user can close the document's tab and return to your page.
If you are linking to a page outside of the current site, open that page in a separate window and copy the page's URL. Click on the chain link icon in the menu bar.
If you are linking to a page within your site, click on "Sites page" and browse to the page. If you are linking to a page outside of the site, click on "Web address" and paste the URL into the "Link to this URL" box. In the "Text to display:" box, type in the text you would like this link displayed as. Generally, when linking to a page outside of the current site, it is best to have the page open in a separate tab, so check the "Open this link in a new window" box.
Before adding a new page, browse to the new page's parent page, and click the "New Page" icon
Enter a name for your page. Unless you have a specific function for the page, such as a list of files to download, leave the "Select a template to use" drop-down on "Web Page". In the "Select a location" area, leave the "Put page under..." option selected. Finally click the red "Create" button at the top of the page.
Click on the gear icon next to the blue "Share" button in the upper-right and select "Page Settings" from the drop-down. This dialog (see pic to left) provides a number of page setting options. In general, you will want to uncheck the "Show links to sub-pages" box, as any subpages will appear in the navigation bar. You may also choose to disallow comments. If you have no files attached or you've created hyperlinks to the attached files, you will want to uncheck "Allow attachments" (note: This does not remove any attached files - it simply removes the list of attached files from the bottom of the page.) In general, you'll want to leave "Show page title" checked, unless you want some other heading to appear at the top of the page.