I've merged your 2 last threads. Please keep further questions on the same subject in the same thread.
As for the .htaccess file, you'd only have to create one single file and place it into your root directory, where all your WP files are in. And the .htaccess file should not be blank, it should contain the line of code I posted above.
If you have further questions, please reply here rather than creating a new thread!