Problems with another page that I manage

Where did you change that? If you mean under Settings > General, then see:

https://codex.www.ads-software.com/Changing_The_Site_URL

if accurate, when I enter visitasxxx.info/wp-admin
I went to General and change visitasxxx.info by visitasx.info now when I try to enter
visitasxxx.info/wp-admin or visitasx.info/wp-admin I can not, please help

So see the link I posted – you’ll need access to your site files on the server or to your database – ask your hosting company how to do either of those.

ok thanks