Redirect link problem in wordpress

I created a login page in wordpress and redirected the page to another website. Now, after clicking on the connection icon in the menu bar, it redirects to another page. It's very good. But I can not access the wp-admin page to edit the wordpress because every time I go to wp-admin (www.energymaterials.org/wp-admin), it redirects back to another page. I can not go to my admin page, of course the login in the menu bar redirects to the page (www.energymaterials.org -> select the login in the menu bar-> it will be redirected to another site ) that I redirected but I can not access my own admin page, which is the most important page. How to solve this problem? Help me, please.