Urgent Help!!!!

Hello!
I have a urgent problem with WordPress, I was changing some settings inside the Admin part of it, and by accident I changed the blog URL to a different website, and now I can’t access anything in my admin, it points to a different URL, I was trying to change the link to another website at the top of the page, but instead I messed up my board and I don’t know what file I need to change to fix my board inside FTP. Any help would be very apprechiated