In Magento remove index.php from URL using below steps. It will convert your URL from

http://www.example.com/index.php/blah

to

http://www.example.com/blah

1.) In Magento Admin > System > Configuration > Web > Search Engine Optimization, change the value of Web Server Rewrites to Yes

Make sure your web server rewrite module is enabled. If you are using apache as your web server on Linux, you can check it by going to /etc/apache2/mods-enabled/rewrite.load, if rewrite.load is present there it means your rewrite module is enabled. If not, you will need to copy rewrite.load from /etc/apache2/mods-available/ and paste it at /etc/apache2/mods-enabled/ location. Then reload the apache by running service apache2 reload.

2.) Check the file permission of .htaccess, it should be present in Magento root directory and readable by server.