How to redirect wordpress admin url?

By mistake i have installed a php script in my root directory, where wordpress is available. After that my all permalinks has been change. After modifying .htaccess file and modified file permission by ftp now Technical Analysis of Stocks site is almost ok. Now i can’y log-in admin panel, when i am giving admin user name and password then url redirect to https://investorsbd.com/index.php/wp-login.php (extra index.php has shown) and nothing found for index php login. How can i remove that extra index.php for log-in my wordpress admin control panel?

Experts ples help me, Thanking in advance.