The old permalink structure of my blogwas :www.ampercent.com/?p=%post_id%.
I changed the structure to http://www.ampercent.com/%category%/%post_id%/ and used the Deanlee permalink migration plugin from http://www.deanlee.cn/wordpress/permalinks-migration-plugin/.
But that didnt worked and showed a 404 error message continuosly.later i added index.php in the new permalink structure and it worked .
Can anyone tell me how do i get rid of that index.php ? Do i need to edit the .htaccess file.I could not find .htaccess file in my site or FTP.
I hope i am clear.Please suggest