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There are two ways to edit specified pages - using FTP access and from Admin Backend in latest version of the System.
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Path to files could be figured out from URL. For example, the path to Help page would be looking like this: https://www.yourdomain.com/exec/help.jsp and path with FTP access would be:
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4) Add correct information to each page using wysiwyg editor.
To edit page in fullscreen mode press on arrow icon. To close fullscreen mode press on arrow icon once again. Text will be saved automatically.
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To see your changes on actual page press Open button
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5) Save all the changes, press "Update" button in the bottom of the Edit domain page.