please help

I have a fatal error. on the dashboard setting i was messing around little bit with the WP URL adress … Just to see what would happen, i replaced the /wordpress to /EPM. this was the original http://maihaba.org/wordpress. to http://maihaba.org/EPM. I knew that directory EPM dose not exist but i foolishly done it never knew that will mess up everything. when i tested my the website maihaba.org it was only the CSS style was showing. i then rested the URL directory to its original http://maihaba.org/wordpress. but it did not updated. but WP still think that the URL directory is http://maihaba.org/EPM..
Please help i run out idea on how to reverse it. plus i can not use the dashbord error The requested URL /EPM/wp-login.php was not found on this server.

How can i change the EPM to be wordpress?