How to remove /wp from URL

So,I make web site and I install WP in sub-directory and made whole site already. And now I have /wp in site URL. When I try change URL in WP admin>settings I cant cuz it’s grey out. I tried everything I find on google and it shows ‘This Website is Under Construction’.The website it’s works when i type example.com/wp. So if anyone have any idea how to remove it please tell me. Thanks thanks in advance.