Save each page separately by selecting [File] [Save] from the main menu. Remember: Do not use spaces or special characters. Use a file name that will make it easy for you to locate the file now and in the future. Consider beginning each file with the title or partial title of the primary menu item. Make sure that file names in your case links file are consistent with what you actually use and record in your problem set folder. You should save each page before you start working on it and of course after.