Subdomain moved now problems getting in admin

Hello,

I just moved my wordpress files to the “root” on my server.
This because I first was testing wordpress on a subdomain.
But now, I can’t get into the wp-admin anymore.

I think it goes wrong, since all URL;s still refer to the test domain. When I get something on the screen, it keeps refering to this test url.

Is there a way where I can change that (not in the admin, since I caan’t get in there)