How can I set canonical url for magento cms page manually from Magento backend
You can set canonical url from design tab of CMS page.
* add/edit a CMS page
* click design tab
* then add follow codes to the field of Layout Update XML
<reference name=”head”> <action method=”addLinkRel”> <rel>canonical</rel> <href>http://softwarehtec.com/</href> </action> </reference>