Changed website url

I was given a website to work on and I changed the wordpress Adress URL. I didn’t know this would remove my ability to access the website but it has. What can I do? I do not have access to the host. Is there any way I can log in to change the URL back?

Here is the link I used to use to log in:

Where I used to log in

So I believe this is the URL?

website url

The person who gave it to me does not have access to the host as well.

Thanks.