first time wordpress ,and first error help please

When did you move your DNS?

First, it can take anything from 24 – 72 hours for DNS changes to fully propagate. Second, different networks will update at different times during this period. That is, bear in mind that just because one provider has updated their records, it doesn’t mean that another will.

thanks it works me bofore 20 minute , so i changed some settings now for the url by default WordPress comes like this “https://yourname.com”
and i changed into “https://www.yournamame.com”
but the connection is out and i cannot go back my old or the new one

so i changed some settings now for the url by default WordPress comes like this “https://yourname.com”
and i changed into “https://www.yournamame.com”

Not clear to me what you did.

-did you change url in the admin? What changes you made?

Change the urls back. See Changing_The_Site_URL for details of how to do this. Then wait at least 2 more days before trying to login to your site again.