Edit : not seen previous response
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have you copied required set of rewrite rules to
.htaccess file ?
^ can you post a clear screen shot of Google SEO part from the plugins page in admin panel ...
there the Google SEO plugin clearly specifies what needs to be done ...
Thank you friend. Now it says
" 404, Meta, Redirect, Sitemap and URL are enabled. (Configure)
Click to Revert changes to core files."
Hope it is complete.
(url also works)