The most useful contributed modules for SEO in Drupal 7 I believe are page_title and metatags_quick. The editing method of these two modules is different. Page_title puts the edit field in the "additional_settings" area at the bottom of the edit page along with menu settings, revision information, comment settings etc. Metatags_quick puts its edit fields in the main part of the screen with title and body.
Here is a screen shot of the basic page edit using these two modules.