While Editing page on your SharePoint you probably encountered a situation when Edit page command in Site action menu is disabled. This is not root error. Edit page command will be disabled when another user has checked-out that particular page.To see which user has done so you will need to navigate to page library on your site. If you have the right permission and you need to edit the page, you can show the page editing toolbar and then click on the page --> Override Check-Out. This will do any changes to other users has made and the page will be checked out to you, but is useful if you really need to make a modification to the page.
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