Page directing to another web page after URL change mistake

I changed my website’s wordpress URL and site URL both and now I can’t login to edit my page and it’s directing me to the url i added by mistake which is another existing website. There’s no access to my web page to edit now, when i add admin address to the browser it’s directing me to the url i added by mistake.
How can I get access to admin again and put my original url again? I can see my page when i search but in poor html display..how can I access editing and change the url again. please help